as far as i understand it wasnt a move to overthrow the english so much as a move to demonstrate the irish people's feelings. i think it was a brave decision for those involved - they really had no chance of winning. just a few men against the british forces. the arms that were sent from germany were discovered and confiscated at port. hence the english realised what was about to happen. most people pulled out then but a few stayed in the city center and barricaded themselves in government buildings surrounded by the opposition to stand up for their cause
also, it set a lot of other influential things into motion; negotiations with britain, handing over of the 36 counties, division of northern ireland, civil war, the troubles in the north...
sorry thats just my two cents on it. theres plenty of history books on it over here. dunno about where you are
^.^"