I am not at home so I don't have access to my files, but FJAG is correct about two batteries in the Niagara area circa 1866. The Welland Canal Field Battery (WCFB), which is the parent of the 10th Field Battery, and the St Catharines Garrision Battery (not its correct name.) Both were called out in June 1866 in response to the Fenian invasion. The St Catharines Battery guarded the river crossing at Chippewa while the WCFB originally guarded the locks at Port Colborne. Both were acting as infantry at the time, as the field battery's guns had been moved to Hamilton to prevent their capture in a Fenian coup de main.
During the early morning hours of June 2nd, 147 years ago today, the WCFB was loaded on the steam tug WT Robb which then steamed into the Niagara River between Fort Erie and Buffalo to prevent Fenians from crossing in either direction. Unfortunately the senior officer on the Robb, LCol J Stoughton Dennis, had delusions of grandeur and decided to land the troops, totaling somewhere between 70 and 80, to take the Fenian surrender when they retreated to Fort Erie after having been defeated in battle further inland. It didn't work out that way as the Fenians had defeated a militia brigade at Ridgeway and retired to Fort Erie to plan their next step - either continue the fight or return to Buffalo. They engaged the WCFB which fought until it was overwhelmed and its members were taken prisoner. At the first shots Dennis ran away and hid in the woods, but escaped censure in a rigged court martial.
The Fenians attempted to return to the US overnight, but were intercepted and arrested by a gun boat, USS Michigan. They were released after a few days to celebrate the only victory of the Irish independence movement between 1798 and 1920. If, however, the WCFB had not been landed, the Fenians would not have been able to escape and would have been brought to battle on June 3rd. By then there were three British and five Canadian infantry battalions along with artillery and cavalry in the area, and the Fenians would have been defeated. That would have put quite a different light on the events of June 2nd, and we very well could still be celebrating the event to this day.