On the 3rd September, Humbert left Castlebar marched towards
Sligo and set up camp at Bellaghy.  He heard that General Lake was
nearby in Ballaghaderreen, however, he decided to move on towards Tubbercurry where he was joined by a large body of Irish Rebels under Capt. O'Dowd.   Various skirmishes took place with the
enemy constantly sniping at Humbert's rearguard.  Having suffered
casualties the crown forces retreated back to Sligo and the Franco-
Irish army moved on towards Colooney. At 11am the following day Humbert set up his HQ in Camphill House on the north side of Collooney. Colonel Vereker, who was in charge of the garrison at Sligo, decided to march on Humbert and deployed his forces at Carrignagat near Collooney. Major Ormsby and his men took up position on a nearby hill while Vereker had the protection of the river on his left.  He then secured his position by placing two guns along the road ahead of the advancing French.  However, Humbert, realising he was compromised by the enemy field guns, ordered Col. Teeling and his Irish rebels to backtrack and surround Ormsby.   One of the field guns, manned by Yeoman Whittier, was causing a lot of French casualties was silenced by Col. Teeling who bravely galloped out from behind the French line and shot the gunner.  The Irish then charged on Ormsby and the French attacked Verkers forces and forced them to retreat to Sligo.   The Franco-Irish forces took over 100 prisoners, including seven officers along with cannon and ammunition wagons.