The Brevity operation was deemed a failure. They simply did not have the strength to attempt the operation in the face of a growing German force. They were fortunate to achieve the early success they did.
The situation changed for the better with the arrival of the Tiger Convoy on 12 May 1941. 135 Inf.Mk.II Matildas, 82 cruiser tanks (at least Cru.Mk.IVA, and maybe Crusader I's), and 21 Lt.Mk.VIC's. The British hoped that the German logistical problems would allow them to continue to hold Halfaya Pass. The 3rd Colstream Guards, some Inf.Mk.II's, 2-pdr anti-tank guns, and AA guns were positioned at Halfaya. A Support Group column was operating on the southern flank. The Germans had about 160 tanks, but these were immobilized due the lack of diesel fuel. This is based on the account in Vol.II of the Official History.