Guerilla War in Iraq escalating?

Today Washington Post writes about the recent insurgent attack on Abu Ghraib. It showed considerable tactical prowess and almost looked like a regular way of war-fighting.

'Ground fighters among the insurgents advanced only after the mortar and rocket assault had ended and attacked the prison from two directions simultaneously. The smaller of the thrusts was apparently a feint to divert attention from the main attack [...]'

Is this an escalation of the war? In Maoist theory on 'People's war' there are three phases. ' In the first phase, the guerrillas gain the support of the population through attacks on the machinery of government and the distribution of propaganda. In the second phase, escalating attacks are made on the government's military and vital institutions. In the third phase, conventional fighting is used to seize cities, overthrow the government and take control of the country.'

Hmm - I don't think Iraq is very comparable to 1940s China. But nevertheless - the attacks on US military installations have been a weak area in the 'Al Qaeda' image since the USS Cole attack in 1998. So it would be obvious if this kind of attack would be sought after by more ideological minded fighters.