Trigger help

I need help making a trigger or most likely multiple triggers. I need to know how to make a trigger that if a team owns all four of the fountains in the middle of the map then they will win. I'm not exactly sure how to trigger this myself but I suspect that I need to use something with changing owner, because that is what the fountains are doing. In your response please respond with the exact or near to exact names of the actions, conditions, events.

Thanks :8

wow... you want to actually try to figure out how to do it yourself, and not ask for the exact triggers.. ill just tell you how. in youre fountain taking over trigger you need check to see if all of the fountains are owned by team 1 and then again for team 2. if it isnt then you go about as normal. if it is then you run victory stuff.

You see I tried to figure this out myself but I forgot to say that I couldn't figure out how to make it check team 1 or team 2. I could only make it do it for one player. Thank you anyways.