HMCS Norsyd was a modified Flower-class corvette that served with the Royal Canadian Navy during the Second World War.

[3] After the war she served as a merchant ship and then as a corvette in the Israeli Navy.

[4][5][6] The "corvette" designation was created by the French as a class of small warships; the Royal Navy borrowed the term for a period but discontinued its use in 1877.

The platform for the 4-inch main gun was raised to minimize the amount of spray over it and to provide a better field of fire.

It was also connected to the wheelhouse by a wide platform that was now the base for the Hedgehog anti-submarine mortar that this version was armed with.

The u-boat was then hunted for two days by four frigates, a minesweeper and aircraft of the Royal Canadian Air Force, but escaped.

In 1946 she emerged as Balboa which was used to smuggle Jewish immigrants into British-held Palestine as part of the Aliyah Bet movement.

[3] She was caught attempting to smuggle Jewish immigrants from Yugoslavia into Palestine by HMS Venus and interned in Haifa.

During Operation Yoav, she, alongside INS Wedgwood, another corvette, engaged Egyptian naval forces and shore batteries.