In Employers etc. Ins. Co. v. Pac. Indem. Co. (1959) 167 Cal.App.2d 369, a question arose whether the insured's loss was covered by a comprehensive liability policy or an automobile insurance policy. The comprehensive liability insurer paid the insured and brought an equitable subrogation action against the automobile insurer. (Id. at pp. 373-374.) The trial court determined the loss was covered under the automobile policy. An issue on appeal was whether the comprehensive liability insurer was a volunteer because it had no legal obligation under the comprehensive liability policy. (Id. at p. 376.) The Court of Appeal concluded the comprehensive liability insurer was not a volunteer: "Even though there was no legal obligation on plaintiff to make the payment it nevertheless had an interest to protect in making it. That interest arose from the fact that there was a dispute between it and defendant as to which policy, plaintiff's or defendant's, covered the accident. That this was such a dispute as justified plaintiff in settling for a less sum than it might have been liable for if its contention that its policy did not cover the accident were incorrect, is shown by defendant's insistence here that the policy did cover the accident." (Id. at p. 377.)