▁helped ▁shut ▁the ▁castle ▁gates . ▁Un be known st ▁to ▁the ▁reb els , ▁the ▁Castle ▁was ▁light ly ▁guard ed ▁and ▁could ▁have ▁been ▁taken ▁with ▁ease . ▁The ▁reb els ▁instead ▁laid ▁sie ge ▁to ▁the ▁Castle ▁from ▁City ▁Hall . ▁F ier ce ▁fighting ▁er upt ed ▁there ▁after ▁British ▁rein for c ements ▁arrived . ▁The ▁reb els ▁on ▁the ▁roof ▁ex changed ▁fire ▁with ▁soldiers ▁on ▁the ▁street . ▁Se án ▁Con n olly ▁was ▁shot ▁dead ▁by ▁a ▁sni per , ▁becoming ▁the ▁first ▁re bel ▁cas ual ty . ▁By ▁the ▁following ▁morning , ▁British ▁forces ▁had ▁re - capt ured ▁City ▁Hall ▁and ▁taken ▁the ▁reb els ▁prisoner . ▁ ▁The ▁reb els ▁did ▁not ▁attempt ▁to ▁take ▁some ▁other ▁key ▁locations , ▁not ably ▁Tr inity ▁College , ▁in ▁the ▁heart ▁of ▁the ▁city ▁centre ▁and ▁def ended ▁by ▁only ▁a ▁hand ful ▁of ▁armed ▁union ist ▁students . ▁Fail ure ▁to ▁capture ▁the ▁tele phone ▁exchange ▁in ▁Crown ▁Al ley ▁left ▁communic ations ▁in ▁the ▁hands ▁of ▁Government ▁with ▁G PO ▁staff ▁quickly ▁repair ing ▁tele phone ▁w ires ▁that ▁had ▁been ▁cut ▁by ▁the ▁reb els . ▁The ▁failure ▁to ▁occup y ▁strateg ic ▁locations ▁was ▁attributed ▁to ▁lack ▁of ▁man power . ▁In ▁at ▁least ▁two ▁inc idents , ▁at ▁Jacob ' s ▁and ▁Stephen ' s ▁Green , ▁the ▁Vol unte ers ▁and ▁Cit izen ▁Army ▁shot ▁dead ▁civ ili ans ▁trying ▁to ▁attack ▁them ▁or ▁dis m ant