OPINION OF THE COURT BY

This is an action for assault and battery committed, as contended, by the defendant upon the plaintiff while the latter was attempting to prevent the former from abating an alleged nuisance.

The parties occupied different lands some distance from a certain dam, made of stone and cement, in the IVIanoa stream. The plaintiff obtained his water through a ditch leading from one end of the dam. The defendant obtained his from a point in the stream below the dam, the water flowing down the stream to that point through a notch in the middle of the dam. It being a time of drought and the defendant and two others not being able to get water, as they claimed, because the plaintiff took it all at the dam, they were in the act of lowering the notch in the dam when the plaintiff came up and attempted to stop them, whereupon a contest ensued in which the plaintiff was hurt to some extent. There is some dispute as to who began the fight and as to just how the plaintiff was hurt— whether by a blow from the defendant or by slipping when attacking the defendant and then sliding down the outer slope of the dam to its bottom.

The plaintiff’s theory -is that, assuming the fact of nuisance and the defendant’s general right to abate it, that right did not go to the extent of permitting a breach of the peace and consequently that it was the defendant’s duty to cease his attempt at abatement as soon as he was resisted and then to have *71recourse to tbe courts to enforce bis rights, and that he was liable for all that he did in excess of his rights.

If the plaintiff and the court had adhered to that theory throughout the case, perhaps the verdict might he sustained, though as to that we express no opinion, but after relying on that theory for the purpose of excluding the evidence offered by the defendant to show that he had a water right, that the dam interfered with that right and that he had a right to abate it, the plaintiff and the court proceeded on a different theory for the purpose of getting and giving an instruction that the defendant had shown no right to justify his attempt to break or cut down any part of the dam and that the plaintiff was justified in resisting such breaking or cutting down by the use of necessary force. The defendant excepted to the exclusion of the evidence and giving of the instruction.

The giving of the instruction, especially after the exclusion of the evidence, was clearly prejudicial error. It practically amounted to a direction for a verdict for the plaintiff, and that, too, on propositions that the defendant was denied the right to disprove. The evidence was excluded on the theory that the action was only for the excess to which the defendant went after beginning lawfully, but the instruction was given on the theory that the defendant was a wrongdoer ad initio. [Moreover, the instruction was prejudicial in itself aside from the exclusion of the evidence. Its first part implied that one could not abate a nuisance of this kind, at least that if he should continue after resistance was offered he would be a wrongdoer from the start. That one may remove so much of a dam as interferes with his right of water in a stream is beyond question. Colburn v. Richards, 13 Mass. 420; Stiles v. Ladd, 5 Cal. 123. How far he may go after resistance depends on the circumstances. See Perry v. Fitzhowe, 8 Q. B. 757; Burling v. Read, 11 Q. B. 904; Davies v. Williams, 16 Q. B. 546; Jones v. Jones, 1 H. & C. 1. The last part of the instruction declared the plaintiff a rightdoer from the start. Even if the defendant were a wrongdoer after resistance was offered, it *72would not follow that the plaintiff was a rightdoer. They may both have been wrongdoers. If the defendant was acting within his rights in abating the nuisance, the plaintiff had no right to interfere with him, even if the defendant would not be justified in committing a breach of the peace in order to prevent such interference.

The exceptions are sustained, the verdict set aside, a new trial ordered and the case remitted to the Circuit Court.