RootsChat.Com

Probably a long shot here but I was wondering if anyone knew anything about the activities of the B Company 3rd Batallion Dublin Brigade during the War of Independance? I've only just found this thread by accident when I was directed to an image posted of the members of the 3rd Batallion but that post was back in 2012. My Great Grandad Patrick O'Neill was listed  on the image as Patick. He would have only been 18-20 years old at the time. He never spoke of his activities during this time and I'd be interested in knowing more of what he might have been up to. His daughter, my Grandmother, was under the impression that he drove for Eoin MacNeill and even for Michael Collins on one or two occasions but after that we're completely in the dark on most of his early life.