European waters Weazel was launched on 22 May 1745 and sailed to Deptford Dockyard for fitout and to take on armament and crew. She was formally commissioned on 24 June under
Commander Thomas Craven, entering Royal Navy service at the height of the War of Austrian Succession which pitted coalitions broadly comprising France, Prussia and Spain, against Britain, the
Habsburg monarchy and the
Dutch Republic. Craven's orders were to take
Weazel into the English Channel and
the Downs to patrol for enemy privateers. The new-built sloop was swiftly in action, capturing the privateer
Le Renard in the Channel on 23 November. In February 1746 Craven was replaced by Lieutenant
Hugh Palliser, who immediately pressed
Weazel back into active service. The 8-gun French privateer
La Revanche was captured on 27 March, followed by
La Charmante on 1 April. One further privateer narrowly avoided capture off
Spithead in early April when
Weazels approach was slowed by light winds. The French vessel escaped only after throwing its cannons overboard to increase its speed. Further victories followed that year with
Weazel capturing the privateers ''L'Epervier
on 29 July, Le Delangle
on 3 August and both La Fortune
and La Jeantie'' on 8 October. At the end of the year Commander Palliser was made
post-captain and assigned to the 70-gun
ship of the line ; his place on
Weazel was taken by Commander
Samuel Barrington. On the morning of 14 October the fleet was offshore from
Cape Finisterre when it encountered a French force of eight ships of the line, escorting a convoy of 252 merchant vessels. Hawke approached from the
leeward while the French sailed
close-hauled in a line ahead, expecting that he would engage in a long-range artillery duel. Instead, Hawke made the signal for a general chase, freeing his captains from the constraints of a formal battle; the British then overhauled the French line and enveloped it from rear to van, capturing six ships. Around 4,000 French sailors were captured or killed, against 757 British casualties. During the battle the merchant convoy, and the remaining two French naval vessels, had escaped to the west with the intention of reaching the French Caribbean.
Weazel had been too small to join the line of battle the previous day, but Admiral Hawke now deputised her to sail in haste for the Royal Navy's
Jamaica Station with a message advising the likely course of the French convoy.
Weazel reached the Caribbean before most of the French convoy; the Royal Navy squadron based in the Leeward Islands put immediately to sea and was successful in intercepting 40 French ships and taking 900 prisoners. On 7 September the intercepted a British convoy and engaged . In the ensuing battle she damaged
Druid, but the approach of the other British escorts, and
Weazel, forced
Raleigh to retire. ==Final voyage==