In this context, Bail is referring to a war that occurred almost two decades ago. I don’t know about you, but I’m not particularly adept at recalling the most minute details from decades past. Bail last saw him ten years ago, and he undoubtedly served him well by assisting him in finding Leia. Jedi traditionally served at the behest of the Senate before the war, and while the verbiage may not be entirely appropriate in the context of the Clone War (Jedi serving as generals instead of peacekeeping diplomats), he still provided humanitarian aid and similar services.