Europe was mildly surprised. And pissed.
If you have no idea who or what Leeroy Jenkins is, here is the original video [link]
A Leeroy Jenkins is basically a gamer who has no time for plans and simply storms right into the battlefield, ruining the rest of the teams plans.
The real inspiration for this picture came from this remix of the video [link]
I just kept seeing America storming right into a minefield with a bunch of countries stumbling after.
Seriously, in those days Europe saw America as the worlds Leeroy Jenkins.