▁their ▁liv elihood s ▁became ▁threatened . ▁ ▁In ▁Mand atory ▁Palest ine ▁from ▁ 1 9 4 5 ▁to ▁ 1 9 4 8 , ▁Jewish ▁groups ▁opposed ▁British ▁control . ▁Though ▁that ▁control ▁was ▁to ▁end ▁according ▁to ▁the ▁United ▁Nations ▁Part ition ▁Plan ▁for ▁Palest ine ▁in ▁ 1 9 4 8 , ▁the ▁groups ▁used ▁sab ot age ▁as ▁an ▁opposition ▁t actic . ▁The ▁H agan ah ▁focused ▁their ▁efforts ▁on ▁cam ps ▁used ▁by ▁the ▁British ▁to ▁hold ▁refuge es ▁and ▁rad ar ▁install ations ▁that ▁could ▁be ▁used ▁to ▁detect ▁illegal ▁imm igr ant ▁ships . ▁The ▁Stern ▁Gang ▁and ▁the ▁Ir gun ▁used ▁terror ism ▁and ▁sab ot age ▁against ▁the ▁British ▁government ▁and ▁against ▁lines ▁of ▁communic ations . ▁In ▁November ▁ 1 9 4 6 , ▁the ▁Ir gun ▁and ▁Stern ▁Gang ▁attacked ▁a ▁rail road ▁twenty - one ▁times ▁in ▁a ▁three - week ▁period , ▁eventually ▁causing ▁shell - sh ock ed ▁Arab ▁railway ▁workers ▁to ▁strike . ▁The ▁ 6 th ▁Air bor ne ▁Division ▁was ▁called ▁in ▁to ▁provide ▁security ▁as ▁a ▁means ▁of ▁ending ▁the ▁strike . ▁ ▁In ▁Vietnam ▁ ▁The ▁V iet ▁Cong ▁used ▁sw immer ▁sab ote urs ▁often ▁and ▁effectively ▁during ▁the ▁Vietnam ▁War . ▁Between ▁ 1 9 6 9 ▁and ▁ 1 9 7 0 , ▁sw immer ▁sab ote urs ▁s unk , ▁destroyed , ▁or ▁dam aged ▁ 7 7 ▁assets ▁of ▁the ▁U . S . ▁and ▁its ▁al