For the protection of the Niagara frontier, all available troops in the immediate vicinity were called out for active service on the 24th of May. The Nineteenth Lincoln Battalion, under command of Lieut.-Col. J. G. Currie, the St. Catharines Troop of Cavalry under Capt. Gregory, and the St. Catharines Battery of Garrison Artillery, were quickly assembled and placed on active service. One company of the 19th was detached to guard the Suspension Bridge at Clifton, in conjunction with three companies of the 44th Welland Battalion. The remainder of the 19th Battalion were posted as follows:--Two companies (with regimental staff) consisting of 12 officers and 87 men, at St. Catharines and Port Dalhousie; one company (Capt. Upper) with three officers and 42 men at Niagara; three officers and 42 men at Port Robinson, three officers and 42 men at Welland, and three officers and 42 men at Allanburg. The St. Catharines Troop of Cavalry (Capt. Gregory) was despatched to Chippawa to patrol the River Road between that point and Fort Erie--one officer and 13 troopers being stationed at Chippawa; one officer and 13 men at Black Creek, and one officer and 14 men at Fort Erie. This command maintained a complete system of patrols along the upper Niagara River. Two companies of the 44th Battalion were also stationed at Chippawa to guard the bridges and approaches to that place. The St. Catharines Battery of Garrison Artillery (Capt. Thomas Oswald) was attached to the 19th Battalion, a portion of the Battery, under Lieut. J. G. Holmes, doing duty in guarding the locks on the Welland Canal at Allanburg, and the remainder being placed on board the tug "Clara Carter" with two field guns, which boat was employed to cruise Lake Erie and the Niagara River. The Queenston Mounted Infantry, under command of Capt. Robert Currie, maintained an efficient patrol of the lower Niagara frontier, with two officers and 18 men at Niagara, and one officer and 18 men at Queenston. The 37th Haldimand Battalion was ordered to Port Colborne, and also the Welland Canal, Field Battery, where they maintained a vigilant, guard on the entrance to the Welland Canal, which was threatened by an Fenian attack. The United States gunboat "Michigan" was at Port Colborne on the 24th, and left on a cruise along the shores of Lake Erie with positive orders from the American Government to sink any piratical craft that might attempt to make a crossing. The Fenians assembled at Buffalo were anxious to get over into Canada, but could not get any ship owners willing to take the risk in face of such orders.