First of all you KNOW generals who are on active duty are not allowed to criticize the Defense Sec., so nice try on that line of crap.
That didn't stop this article from coming out during the invasion.

Washington, DC (Reuters) - Defense Secretary Donald Rumsfeld repeatedly rejected advice from Pentagon planners that substantially more troops and armor would be needed to fight a war in Iraq, New Yorker Magazine reported.
In an article for its April 7 edition, which goes on sale on Monday, the weekly said Rumsfeld insisted at least six times in the run-up to the conflict that the proposed number of ground troops be sharply reduced and got his way.
"He thought he knew better. He was the decision-maker at every turn," the article quoted an unidentified senior Pentagon planner as saying. It also said Rumsfeld had overruled advice from war commander Gen. Tommy Franks to delay the invasion until troops denied access through Turkey could be brought in by another route and miscalculated the level of Iraqi resistance.

Six retired generals (who waged the war in Iraq) have called for Rumsfeld to resign, accusing him of mishandling the Iraq war, ignoring advice of field commanders and having an arrogant management style.