▁H MT ▁S arn ia ▁and ▁land ed ▁at ▁Gal lip oli ▁on ▁ 1 6 ▁October . ▁Here ▁the ▁ 2 / 1 st ▁London ▁Brigade ▁was ▁attached ▁to ▁the ▁Royal ▁Naval ▁Division , ▁the ▁ 2 / 3 rd ▁and ▁ 2 / 4 th ▁B ns ▁joining ▁ 1 st ▁Royal ▁Naval ▁Brigade . ▁ ▁Gal lip oli ▁ 2 / 4 th ▁Lond ons ▁received ▁their ▁introduction ▁to ▁tren ch ▁war fare ▁in ▁the ▁' E ski ' ▁reserve ▁line ▁between ▁ 2 0 ▁and ▁ 2 7 ▁October , ▁and ▁suffered ▁their ▁first ▁battle ▁cas ual ties . ▁There after ▁they ▁did ▁seven - day ▁t ours ▁of ▁duty ▁in ▁the ▁reserve ▁line ▁altern ating ▁with ▁' rest ' ▁in ▁flo oded ▁cam ps ▁in ▁the ▁rear . ▁In ▁December ▁the ▁batt alion ▁took ▁over ▁front line ▁tren ches . ▁Between ▁ 3 1 ▁December ▁and ▁ 8 ▁January ▁ 1 9 1 6 ▁the ▁batt alion ▁was ▁ev acu ated ▁to ▁M ud ros ▁by ▁det ach ments ▁as ▁the ▁Gal lip oli ▁operation ▁was ▁closed ▁down . ▁From ▁M ud ros ▁the ▁batt alion ▁was ▁taken ▁to ▁Alexand ria ▁ab o ard ▁H MT ▁I onian , ▁arriv ing ▁on ▁ 2 1 ▁January . ▁ ▁Sen us si ▁campaign ▁In ▁Egypt , ▁the ▁batt alion ▁was ▁sent ▁to ▁join ▁a ▁force ▁at ▁Min ia ▁guard ing ▁the ▁N ile ▁against ▁a ▁potential ▁attack ▁by ▁Sen us si ▁reb els . ▁The ▁ 2 / 4