attack on Derryard checkpoint
...the Provisional IRA attack on Derryard checkpoint was carried out by a flying column of volunteers, created in an attempt to avoid infiltration by informers?
...the <a class="mw-redirect" href="./Provisional_IRA" id="mwED4" rel="mw:WikiLink" title="Provisional IRA">Provisional IRA</a> <b id="mwED8"><a href="./Attack_on_Derryard_checkpoint" id="mwEEA" rel="mw:WikiLink" title="Attack on Derryard checkpoint">attack on Derryard checkpoint</a></b> was carried out by a <a href="./Flying_column" id="mwEEE" rel="mw:WikiLink" title="Flying column">flying column</a> of <a href="./Volunteer_(Irish_republican)" id="mwEEI" rel="mw:WikiLink" title="Volunteer (Irish republican)">volunteers</a>, created in an attempt to avoid infiltration by <a class="mw-redirect" href="./Supergrass_(informer)" id="mwEEM" rel="mw:WikiLink" title="Supergrass (informer)">informers</a>?