The trial judge denied recovery because he held that the loss incurred was not caused by any “peril of the seas.” As his findings show, the loss occurred as follows: The “sea” (i.e., water from the river) leaked into the carfloat; this caused the vessel to list and settle; this, in turn, caused some of the railroad’s cars and their cargo to slide into the river; then the vessel lurched and other cars and their cargo also fell into the river. The judge held that railroad’s employees had been guilty of “gross negligence” which was “the immediate cause and the only cause of the accident.” The “gross negligence” consisted of taking a chance that the carfloat could be towed in spite of its known condition.

*464The loss resulted from a “peril of the seas.” “It is enough that damage be done by the fortuitous action of the sea. For instance, where cargo was damaged by the incursion of seawater through a hole in a pipe gnawed by rats, the House of Lords held this to be a peril of the seas.”1 That the sea is calm makes no difference.2 Negligence, whether or not “gross,”3 but for which the accident would not have occurred, will not serve as a defense to such a policy. Only “wilful misconduct,” measuring up to “knavery” or “design,” will suffice; and neither the evidence nor the judge’s findings of fact show such conduct. True, the judge, in the last paragraph of his opinion, referred to the gross negligence as if it constituted wilful misconduct. There we think he erred. In Orient Insurance Co. v. Adams, 123 U.S. 67, 8 S.Ct. 68, 31 L.Ed. 63, the master, before his vessel had steam up, negligently gave orders to cast off into the current of a river; as a result, the vessel was carried over a waterfall and sank. In affirming a judgment, on a verdict in favor of the plaintiffs, under a policy insuring them against “perils of the seas,” the Court said, 123 U.S. at page 73, 8 S.Ct. at page 71: “But it is insisted that the court should have granted the request of the company, to the effect that it was not liable if the accident and loss were caused by the ‘misconduct’ of the master. Had that request been granted, in the form asked, the jury might have supposed that the company was relieved from liability if the master was chargeable with what is sometimes described as gross negligence, as distinguished from simple negligence. Hence the court properly said, in effect, that the misconduct of the master, unless affected by fraud or design, would not defeat a recovery on the policy. The principle upon which the court below acted was that expressed by Chief Justice Gibson in American Ins. Co. v. Insley, 7 Pa.St. 223, 230, when he said that ‘public policy requires no more than that a man be not suffered to insure against his own knavery, which is not to be protected or encouraged by any means; 3a for though the maxim respondeat superior is applicable to the responsibility of a master for the acts of his servants, yet the insured, so long as he acts with fidelity, is answerable neither for his servants nor for himself.’ ” See also Dudgeon v. Pembroke, 2 A.C. 284; Trinder, Anderson & Co. v. Thames and Mersey Mar. Ins. Co. (1895), 2 Q.B. 114; Waters v. Merchants’ Louisville Ins. Co., 11 Pet. 213, 221-223, 9 L.Ed. 691.

In Olympia Canning Co. v. Union Marine Ins. Co., 9 Cir., 10 F.2d 72, 74, the court said: “In Davidson v. Burnand, L.R. 4 C.P. 117, the policy included perils of the sea. While the vessel was loading in the harbor her draft was increased by the weight of cargo until the discharge pipe was brought below the surface of the water. The cock of that pipe had been negligently left open. Water flowed into the hold causing injury to-cargo. Willes, J., could find no distinction between loss from an accident happening through the negligence of the crew of another vessel and loss from accident happening from the negligence of the crew of the vessel on which the loss was occasioned, all such distinction having been swept aside by Dixon v. Sadler, 5 M. & W. 405. Keating, J., was of the same opinion, as was also Brett, J., who, speaking of the manner in which, the injury occurred said: ‘The water got. in, not by the happening of any ordinary-occurrence in the ordinary course of the *465voyage, but by the accidental circumstances of some cock having been left open by the negligence of the crew. This is, in my opinion, sufficient to make the underwriter liable. Cases of like purport are Devaux v. J’Anson, 5 Bing. (N.C.) 515, and Walker v. Maitland, 5 Barn. & Ald. 171.’ We find no case which overrules or calls in question the doctrine of the foregoing authorities. Guided thereby, we reach the conclusion that by the maritime laws and customs of England the loss in the case at bar was proximately caused by the overturning of the vessel under the impulse of tidal and river currents, although the accident would not have occurred, but for the negligent loading of cargo taken on board at Tacoma; that the overturning of the vessel was a peril of the sea, within the provisions of the insurance contract; and that the action of the sea was the immediate cause of the accident. In Smith v. Scott, 4 Taunt. 125, Lord Mansfield said: 'I do not know how to make this out not to be a peril of the sea. What drove the Margaret against the Helena? The sea. What was the cause that the crew of the Margaret did not prevent her from running against the other? Their gross and culpable negligence; but still, the sea did the mischief.’ ”

A determination by a trial judge of the existence of negligence is not a finding of fact but a legal conclusion.4 So, too, is a determination as to “wilful misconduct.” Accordingly, the judge’s statement as to such conduct is not binding on us. And, as this is not a tort action, the horrendous niceties of the doctrine of so-called “proximate cause,” employed in negligence suits,5 apply in a limited manner only to insurance policies.6

We do not agree with the trial judge that the libelant’s gross negligence was the sole cause of the accident. Nor do we agree with his conclusion that the “loss was inevitable” because of the way the carfloat was loaded and of her condition.7 The evidence shows a concatenation of fortuitous circumstances (including misunderstanding by the dispatcher of some of the reports made to him about the vessel’s listing).

*466Cases cited by appellees are inapposite: Union Ins. Co. v. Smith, 124 U.S. 405, 8 S.Ct. 534, 31 L.Ed. 497, related to a policy which expressly excepted perils “consequent upon” and “arising from” or “caused by incompeteney of the master” or “want of ordinary care and skill in navigating said vessel,” and “all unseaworthiness.” 8 Diethelm & Co. v. The Flying Trader, D.C.S.D.N.Y., 141 F. Supp. 271, involved no insurance policy; it was a suit against an ocean carrier which defended on the ground that bills of lading excluded damage due to perils of the sea (and which was nevertheless required to pay for damage to cargo injured in a moderate gale). In Chicago S.S. Lines v. U. S. Lloyds, D.C.N.D.M., 2 F.2d 767, affirmed, 7 Cir., 12 F.2d 733, the policy contained an express warranty against the master’s negligence.9 Henjes v. Aetna Ins. Co., 2 Cir., 132 F.2d 715, 720, also related to a breach of an express warranty.

Western Assur. Co. of Toronto, Canada v. Shaw, 3 Cir., 11 F.2d 495, a case cited by the trial judge, concerned a policy expressly excepting all claims arising “from the want of ordinary care and skill in loading and stowing the cargo.” Such, or related cases, we need not consider, since appellees close their brief with the statement: “It has never been maintained by the insurers that the policies in suit contain an express or implied warranty of seaworthiness; neither has it been maintained that they contain an express ‘due care’ warranty.”

Appellees correctly disclaimed defense of an implied warranty of seaworthiness, since these are time policies.10 However, appellees, referring to the English Marine Insurance Act (1906) as purporting to codify the English “case law,” cite Section 39(5) of that Act which provides: “In a time policy there is no implied warranty that the ship shall be seaworthy at any state of the adventure, but where, with the privity of the assured, the ship is sent to sea in an unseaworthy state, the insurer is not liable for any loss attributable to unseaworthiness.” Appellees contend that the emphasized words relieve them of liability here. We think not. We assume, arguendo, (1) that the evidence showed the “privity of the assured” and (2) that, in each of the numerous trips made by this busy carfloat, it was “sent to sea” when it left its moorings. Even so, we reject appellees’ contention. For, when the loading occurred and when the accident happened, the carfloat had not been “sent to sea” but was still moored. The rider to the policy expressly provides that the insurance applies while *467the vessel is thus moored and “while being loaded.”

We reverse with directions to enter a decree in favor of appellant for its stipulated loss, together with interest and costs.