William joined the military when he was 18 and after training, he was put into 1 Rifles. Bill, finding military life less exciting than he thought it would be, quickly jumped at the chance to be deployed under the UN being involved in peace keeping operations. He was then stationed in Miroslavl.
Events unfolded with the UN in South Zagoria, which resulted in the UN pulling out of there.
Whilst out on patrol, Bill still in Miroslavl, was attacked and captured by a group of hostile survivors. Bill and the rest of his group where held for weeks, traded between other groups as cargo. He managed to escape but only because his group of captives was attacked by another, maybe because of a trade gone wrong, maybe because of other reasons but it doesn't really matter.
After days of travelling, Bill ended up in South Zagoria, hoping to find remnents of UN forces there.