MONTROSE, N.B.—On the 5th March, during a very heavy gale from the S.S.E., and an exceedingly heavy sea, accompanied by a snowstorm, the schooner Agnes, of Llanelly, bound thence to Newcastle, while running for Montrose Harbour, went ashore on the sands to the northward of the Annat Bank., The No. 2 Life-boat JRoman Governor of Caer Hun immediately put offto her assistance through a very heavy surf, and, after a severe struggle, rescued her crew of five men. In the absence of the regular crew, this Life-boat was partly manned by eight young fishermen, who volunteered for the service, and who behaved admirably under very arduous circumstances..