I just go and dump the required number, usually in 3 to 5 tries

I will get the win I need for the bonus

You can tell by the team you are against so ESC and dump it...

BUT every now and then, very rarely, I will actually get 2 wins

BUT usually it is my mid game team VS lvl 100s that have completed 100% Great Hall 

almost like the game is deliberately feeding my teams to cashers