By 31 December, the gunboat had moved to Sorel, Quebec, where she remained into March 1943. On 3 March, she got underway to descend the St. Lawrence River, bound ultimately for Boston, Massachusetts. On 5 March, she stopped at Quebec, Canada, and remained there for two months. Alacrity resumed her voyage on 5 May and arrived at the Boston Navy Yard Annex on 12 May. She remained there until sometime in mid-July, when she sailed for Bermuda and shakedown training in the waters surrounding that island group. She completed shakedown on 15 August and arrived in New York City three days later. After a round-trip voyage apiece to Norfolk, Virginia, and Boston, Alacrity entered the navy yard at Boston for post-shakedown repairs on 21 September.
