Win Conditions for a footmen wars

I'm making my own footmen wars, and i need to construct win conditions. It's 12 player 3v3v3v3. The building are placed with a trigger. When 3 forces townhalls are destroyed the surviving force should win. I'm not sure how to do this...

the meele winning conditions

Make a variable for each the forces, then do this:
Event- a unit dies
Condition- unit type of dying unit equal to (your townhall, if there is multiple types of ones, use unit classification check instead)
Action- If then else-If owner of dying unit is on (one of the forces) then do set the variable for that force +1 else(Do the same action as before, but setting the other force variable).
Another action comes after
If\then\else -Integer comparison-(Variable of one of the forces) equal to 3
Then set victory for the other one and defeat all the other players.
(do another if\then\else for the other force).
You can put a cinemmatic or something on the last if\then\else functions, just make sure to put what I said.