Happened to me last night, I even said please but the other guy said, "I'm sorry, but we can't let you do that"
I said "pretty please," and it worked. We won 100% - 0... also got a medal for courteousness
That medal was well earned. I should probably set up some polite macros.
Next civil war map, I'm going to have the whole team form a circle around the objective at mid.
I will also be adding this to my strategy.