what does "commence the ground advance"mean?
the relative context is :
[The U.S. kept an Army division off the coast of Turkey, which undoubtedly led the Iraqis to believe that coalition forces would come from north and south simultaneously. Tactical surprise was also gained by commencing the ground advance slightly before the air attack. Saddam and his generals believed that the war, like 1991’s Persian Gulf War before it, would begin with weeks of a bombing campaign before any ground forces would enter Iraq. The lightning advance of U.S. ground troops to Baghdad demoralized Iraqi forces and led to the fall of Saddam’s government within three weeks of the start of major combat operations. ]does it mean "deploy ground troops "?