<p>In August 2014, Jim Gavin's Dubs seemed unstoppable. They were playing football at a level not seen in years ? overwhelming opposition and seemingly growing stronger with every game.<br>Nobody saw it coming: Donegal's beautifully timed semi-final ambush. The Ulstermen laid bare a chink in the Sky Blues' armour; a tactical hole which Gavin immediately set about filling.<br>Dublin would not lose a championship game again for 2,540 days ?<br>Eric...