Kitchener was anxious to occupy Omdurman before the remaining Mahdist forces could withdraw there. He advanced his army on the city, arranging them in separate columns for the attack. The British light cavalry regiment, the 21st Lancers, was sent ahead to clear the plain to Omdurman. They had a tough time of it. In what has been described as the last operational cavalry charge by British troops, the 400-strong regiment attacked what they thought were only a few hundred dervishes, but in fact there were 2,500 infantry hidden behind them in a depression. After a fierce clash, the Lancers drove them back (resulting in three Victoria Crosses being awarded to Lancers who helped rescue wounded comrades). One of the participants of this fight was Lieutenant Winston Churchill. On a larger scale, the British advance allowed the Khalifa to re-organize his forces. He still had over 30,000 men in the field and directed his main reserve to attack from the west while ordering the forces to the northwest to attack simultaneously over the Kerreri Hills.