▁ 2 nd ▁Line ▁batt alion ▁to ▁continue ▁the ▁coast ▁defence ▁duties . ▁In ▁ 1 9 1 7 ▁the ▁batt alion ▁joined ▁the ▁W az ir istan ▁Field ▁Force ▁as ▁inf antry ▁and ▁took ▁part ▁in ▁the ▁W az ir istan ▁Camp aign ▁of ▁that ▁year . ▁In ▁April ▁ 1 9 1 9 ▁it ▁was ▁on ▁security ▁duty ▁at ▁Am rit s ar ▁at ▁the ▁time ▁of ▁the ▁J al li an w ala ▁Bag h ▁mass acre , ▁then ▁from ▁May ▁to ▁August ▁took ▁part ▁in ▁the ▁Third ▁Afghan ▁War , ▁including ▁the ▁Rel ief ▁of ▁Th all , ▁ ▁before ▁finally ▁being ▁dem obil ised ▁almost ▁a ▁year ▁after ▁the ▁end ▁of ▁World ▁War ▁I . ▁ ▁Inter war ▁In ▁ 1 9 2 0 ▁the ▁RE ▁Sign al ▁Service ▁became ▁the ▁independent ▁Royal ▁Corps ▁of ▁Sign als ▁( R CS ). ▁ 4 7 th ▁( 2 nd ▁London ) ▁Sign al ▁Company ▁merged ▁with ▁the ▁ 2 5 th ▁( Count y ▁of ▁London ) ▁Cy cl ist ▁Battalion , ▁and ▁the ▁combined ▁ 4 7 th ▁( 2 nd ▁London ) ▁Div is ional ▁Sign als ▁established ▁its ▁H Q ▁at ▁the ▁Cy cl ists ' ▁dr ill ▁hall ▁at ▁Ful ham ▁House ▁in ▁Ful ham . ▁It ▁also ▁admin ister ed ▁a ▁number ▁of ▁other ▁T A ▁and ▁ ▁Supp lement ary ▁Reserve ▁( SR ) ▁signal ▁units ▁based ▁at ▁Ful ham ▁House : ▁▁▁ 2 0 4 th ▁Med ium ▁Art illery ▁Sign al