Guns were, of course, a vital ingredient in the IRA’s attempts to escalate their campaign and force a British political response. But the major impact was made by explosives used in a myriad of ways: car bombs, nail bombs, the carrier-bag bomb, bombs walked into Belfast city centre by women pretending to be pregnant, cigarette packet incendiary devices. In 1971 the British authorities recovered one ton of explosives, in 1972, eighteen tons