atori . ▁ ▁Oper azione ▁E ▁ ▁Marsh al ▁Rod ol fo ▁Gra z iani ▁re vised ▁, ▁the ▁plan ▁for ▁the ▁invasion ▁of ▁Egypt ▁by ▁the ▁ 1 0 th ▁Army ▁and ▁made ▁S idi ▁Bar ran i ▁the ▁objective , ▁six ▁days ▁before ▁the ▁dead line ▁for ▁an ▁invasion ▁im posed ▁by ▁M uss ol ini . ▁XX II ▁Corps ▁( ▁Pet ass i ▁Man ella ) ▁was ▁in ▁general ▁reserve , ▁XX I ▁Corps ▁( Gener ale ▁di ▁Cor po ▁d ' Arm ata ▁Lorenzo ▁Dal maz zo ) ▁was ▁at ▁Tob ru k ▁as ▁the ▁ 1 0 th ▁Army ▁reserve ▁with ▁the ▁un - mot or ized ▁ 6 1 st ▁Infantry ▁Division ▁Sir te , ▁ 2 nd ▁Black sh irt ▁Division ▁( 2 8 ▁October ) ▁and ▁a ▁light ▁tank ▁batt alion . ▁The ▁XX III ▁Corps ▁( Gener ale ▁di ▁Cor po ▁d ' Arm ata ▁Ann ib ale ▁Berg on z oli ) ▁compr ised ▁the ▁un - mot or ized ▁ 6 4 th ▁Infantry ▁Division ▁Cat anz aro ▁and ▁ 4 th ▁Black sh irt ▁Division ▁( 3 ▁January ). ▁ ▁A ▁northern ▁column ▁with ▁the ▁Italian ▁non - mot or ised ▁divisions ▁was ▁to ▁advance ▁down ▁the ▁Via ▁Bal bia ▁coast ▁road , ▁cross ▁the ▁front ier ▁and ▁attack ▁through ▁the ▁Half aya ▁Pass , ▁to ▁occup y ▁S oll um ▁and ▁capture ▁S idi ▁Bar ran i . ▁A ▁southern ▁column ▁with ▁the ▁ 1 st ▁Lib yan ▁Division ▁Sib