s ▁Central ▁Park ▁to ▁the ▁United ▁Nations ▁Pla za , ▁behind ▁a ▁b anner ▁" V ietnam ▁V eter ans ▁Again st ▁the ▁War " ▁as ▁part ▁of ▁at ▁least ▁ 1 0 0 , 0 0 0 ▁protest ers ▁in ▁a ▁demonstr ation ▁organized ▁by ▁the ▁Spring ▁M obil ization ▁Committee ▁to ▁End ▁the ▁War ▁in ▁Vietnam , ▁mark ing ▁a ▁new ▁development ▁in ▁which ▁American ▁v ets ▁would ▁join ▁the ▁anti - war ▁movement . ▁Six ▁of ▁the ▁veter ans ▁would ▁form ▁an ▁organization ▁of ▁the ▁same ▁name ▁after ▁the ▁march . ▁What ▁was ▁described ▁as ▁" the ▁largest ▁peace ▁demonstr ation ▁in ▁dec ades " ▁ ▁in ▁Manh attan ▁last ed ▁for ▁four ▁hours . ▁ ▁Later ▁in ▁the ▁day , ▁a ▁group ▁called ▁V eter ans ▁for ▁Peace ▁in ▁V iet - N am ▁would ▁be ▁among ▁ 6 0 , 0 0 0 ▁protest ing ▁the ▁war ▁at ▁Ke zar ▁Stadium ▁in ▁San ▁Francisco . ▁When ▁the ▁New ▁York ▁march ers ▁reached ▁She ep ▁M ead ow ▁in ▁Central ▁Park , ▁a ▁group ▁of ▁protest ers ▁set ▁fire ▁to ▁an ▁American ▁flag , ▁and ▁the ▁Associ ated ▁Press ▁photograph ▁ran ▁in ▁newsp apers ▁across ▁the ▁U . S ., ▁prompt ing ▁the ▁Congress ▁to ▁pass ▁the ▁first ▁federal ▁prohib ition ▁against ▁flag ▁burning . ▁ ▁Fort y - one ▁South ▁Vietnam ese ▁soldiers ▁were ▁killed ▁and ▁ 5 0 ▁seriously ▁wounded ▁in ▁the ▁Bin h ▁Din h ▁Province ▁when ▁two ▁U . S . ▁Air ▁Force ▁j ets