General Tommy Franks also angrily told reporters ground troops had not been ordered to stop making their way towards Baghdad.
There had been rumours they were forced to wait for supplies to catch up with them and that Iraqi fighting was stronger than they had expected.
He reported lots of progress was being made in other areas of Iraq too.
An attack by UK forces south east of Basra is still going on, but they are facing strong fighting from Iraqi soldiers.
A UK soldier was confirmed as killed in fighting there.
Elsewhere in southern Iraq, fresh water supplies were delivered by UN aid trucks which had driven up from Kuwait.