Major General Roy Urquhart's original plan envisaged the 1st Airlanding Brigade securing the drop zones for subsequent lifts, but by the end of day one the Allied advance into Arnhem had stalled. Only a small group of the 1st Parachute Brigade, mainly elements of Lieutenant Colonel John Frost's 2nd Battalion, were able to reach the bridge. The 1st and 3rd Battalions were unable to penetrate the outer suburbs of the city and their advance stalled, so in order to support them the first lift of the South Stafford's were sent forward on the morning of 18 September. When the second lift arrived later that day they too were sent forward and arrived at the outskirts of Arnhem that night. The South Staffordshire's anti-tank platoon was kept in the divisional area.