Conquer in 1 turn!

Hi,
Have been playing a few games now, was actually in very good positions.
All of a sudden, 1 player who maybe has 2-3 territories left stacks up all his armies and takes the world in one go!!!!
How is this possible, during attack, is it possible to get extra armies???

Have been playing a few games now, was actually in very good positions.
All of a sudden, 1 player who maybe has 2-3 territories left stacks up all his armies and takes the world in one go!!!!
How is this possible, during attack, is it possible to get extra armies???

