Todd Wainio: Denver, Colorado, USA

Yonkers was a horrible defeat for the United States Army. The 'Zack', what zombies are called by the military, had completely crushed the US Army's fortified position. The problem was that they were ordered to set up on the streets, dig foxhole to hide in and barricades, when they were surrounded by plenty of houses and tall buildings that they could've just stationed themselves on top of and picked off the zombies. That was the one of the downfalls of the military operation at Yonkers. The another downfall was that it was impossible to 'Shock and Awe' the living dead. Artillery may have blown they to pieces, but unless it destroyed their brain, they didn't care.
Finally, and probably the biggest error of Yonkers, they didn't have nearly enough artillery or ammo to take out the hordes of thousands of zombies. They only had enough to take out the beginning of them, but the hundreds of thousands that followed them wouldn't be able to be killed. If they had been overall smarter about their positioning of their troops and weaponry then I think that Yonkers would have turned out differently.