Sligo claimed a shock victory in the Europa League second qualifying round as they claimed a 2-1 win over Rosenborg in Norway.
Captain Alan Keane and Danny North had the Irish side 2-0 up before an own-goal from goalkeeper Gary Rogers handed the 22-time Norwegian champions a lifeline for the second leg.
The return leg will be played in the Showgrounds next Thursday July 24.
Dundalk did not fare so well in their first leg as they lost 2-0 at home to Hajduk Split thanks to goals from Mijo Caktas and Nikola Vlasic.
Substitute Andy Waterworth grabbed a winner three minutes from time as Linfield claimed a 1-0 home win over AIK but that was as good as it got for the Northern Irish teams.
90 + 4' mins: FULL TIME: Linfield 1 - 0 AIK Solna. What a performance from Linfield as they travel to Stockholm with a 1 goal lead— Linfield FC (@OfficialBlues) July 17, 2014
Derry went down 1-0 at home to Shakhtyor thanks to a goal from Nikolai Yanush while strikes from Dardan Rexhepi, Mauricio Albornoz, Jacob Larsson and a penalty from Niklas Barkroth saw Crusaders lose 4-0 to Brommapojkarna in Sweden.