By the end of the month, the convoy had reached Gibraltar. During May and June as the forces scheduled to participate in Operation "Husky" — the invasion of Sicily — gathered in Algerian and Tunisian harbors — "Seer", now a unit of the 8th Amphibious Force's Escort-Sweeper group, escorted ships to Bizerte, Oran, Ghazaouet, and Sousse; and patrolled off these ports. On 6 July, she joined the "Joss" attack force; and, on the 9th, she departed for Sicily. The next morning, she arrived off Licata; and, as the 3rd Infantry Division went ashore, she patrolled on a line four miles off "Red Beach". On the 11th, she was en route back to Bizerte to join another landing craft convoy and escort it to southern Sicily.