HMS St Lawrence, a 112 gun first rate ship of the line, served during which war?

The Royal Navy's,The HMS St Lawrence, served shortly during the closing months of the War of 1812. She was larger than the 104 gun flagship of Horatio Nelson, HMS Victory, which had been present at the decisive Battle of Trafalgar. She was built in response to a naval race for the control of Lake Ontario during the War of 1812.

She was the only Royal ship of the line to launch and operate entirely on a fresh body of water. She was launched in September 1814. The Americans did appear off Kingston, the St Lawrence's homeport, the day after she launched, to give battle, which was declined. Her presence, though, gave the British control of Lake Ontario toward the end of the war.

There were several problems with the St Lawrence. First, though she protected the supply routes to possible invasion routes into New York, she consumed so many resources in her construction, that it was a detriment to efforts elsewhere. The outnumbered Americans defeated the British on Lake Champlain at this time. Resources utilized in the St Lawrence's construction would've tilted victory toward the British there. Second, the Americans were constructing ships to match on Lake Ontario, thus, extending the naval race and war.

The Treaty of Ghent (1814), which ended the War of 1812, made the naval race moot. Effectively stranded inside Lake Ontario, the St Lawrence was decommissioned. She was later sold. She sank and is rotting away with her sister ships at the bottom of Lake Ontario.