Here "camp" refers to the whole Midianite army. The word "victory" is an abstract noun that can be translated as a verb or an adjective. Alternate translation: "Attack the Midianites at their camp, for I am going to help you defeat them" or "Attack the Midianites at their camp, for I am going to cause you to be victorious over them" (See: [[rc://en/ta/man/jit/figs-metonymy]] and [[rc://en/ta/man/jit/figs-abstractnouns]])