She had a single screw, driven by a three-cylinder triple-expansion engine that was built by William King & Co of Glasgow, and rated at 92 NHP.

[8] On 27 August the revenue cutter W. E. Chandler took a USCS officer to Stapleton, Staten Island, where he boarded and seized Conqueror in lieu of $30,500 duty.

Technically the lawsuit was against Conqueror, but in effect it was against the Collector of the Port of New York, Jacob Sloat Fassett.

[7] On 19 October 1891, the Supreme Court of the United States granted William Howard Taft, Solicitor General of the United States, leave to file a petition for a writ to prohibit the Judge of the District Court from hearing Vanderbilt's libel.

[15] By 28 January the District Court had heard the case, and Judge Addison Brown had found in Vanderbilt's favour.

[17] On 28 January 1893, Conqueror left the Erie Dry Dock, Brooklyn, to begin a cruise from New York to the West Indies.

Only the crew was aboard, as FW and Mrs Vanderbilt and their guests planned to travel in his private railroad car Mariquita to Brunswick, Georgia, where they were to board the yacht.

[17] Mr. and Mrs. Vanderbilt used Conqueror to entertain guests at Newport, Rhode Island,[18][19] and to watch New York Yacht Club races.

[20][21] In March 1896, FW Vanderbilt ordered a new "naphtha launch" to carry aboard Conqueror as a replacement for her steam tender.

[25] In March 1901, FW Vanderbilt took a group of male guests on a cruise on Conqueror to the West Indies.

[28] In summer 1903, Mr. and Mrs. Vanderbilt went to Germany for that year's Bayreuth Festival, and for the unveiling ceremony of the Richard Wagner Monument in Berlin.

Robert Collier and his wife used Conqueror to spend most of August in Newport; to visit New Haven, Connecticut;[34] and to see a sailing-yacht race off New York.

[36] However, Mr. and Mrs. Vanderbilt used Conqueror to attend Kiel Week in Germany in June 1905,[37] and to return across the North Atlantic to the US that July.

[39] Some owners paid, but others objected to the tax being applied retrospectively to yachts built before the act was passed.

[40] By 17 September, FW Vanderbilt had asked William Loeb Jr., Collector of the Port of New York, to appraise Conqueror for the new tax.

[46] On 25 September 1916, Conqueror II was patrolling with the naval trawler HMT Sarah Alice in Fair Isle Channel.

[50] Another 17 men from Conqueror II survived in Carley floats, and at 04:00 hrs the next morning the destroyer HMS Sylvia rescued them.