The 2003 invasion of Iraq, from March 20 to May 1, 2003, was spearheaded by the United States, backed by British forces and smaller contingents from Australia, Spain, Poland and Denmark. Four countries participated with troops during the initial invasion phase, which lasted from March 20 to May 1. These were the United States (248,000), United Kingdom (45,000), Australia (2,000), and Poland (194). 36 other countries were involved in its afterm...