sentences:  In December 1867, O'Neill became president of the Roberts faction of the Fenian Brotherhood, which in the following year held a great convention in Philadelphia attended by over 400 properly accredited delegates, while 6,000 Fenian soldiers, armed and in uniform, paraded the streets.At this convention, the second invasion of Canada was conceived.The news of the Clerkenwell explosion was a strong incentive to a vigorous policy.