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When Lusitania was built, her construction and operating expenses were subsidised by the British government, with the proviso that she could be converted to an armed merchant cruiser (AMC) if need be. A secret compartment was designed in for the purpose of carrying arms and ammunition. When war was declared she was requisitioned by the British Admiralty as an armed merchant cruiser, and she was put on the official list of AMCs. Lusitania remained on the official AMC list and was listed as an auxiliary cruiser in the 1914 edition of Jane's All the World's Fighting Ships, along with Mauretania.
The Declaration of Paris codified the rules for naval engagements involving civilian vessels. The so-called Cruiser Rules required that the crew and passengers of civilian ships be safeguarded in the event that the ship is to be confiscated or sunk. These rules also placed some onus on the ship itself, in that the merchant ship had to be flying its own flag, and not pretending to be of a different nationality. Also, it had to stop when confronted and allow itself to be boarded and searched, and it was not allowed to be armed or to take any hostile or evasive actions. When war was declared, British merchant ships were given orders to ram submarines that surfaced to issue the warnings required by the Cruiser Rules.
At the outbreak of hostilities, fears for the safety of Lusitania and other great liners ran high. During the ship's first east-bound crossing after the war started, she was painted in a grey colour scheme in an attempt to mask her identity and make her more difficult to detect visually. Many of the large liners were laid up in 1914–1915, in part due to falling demand for passenger travel across the Atlantic, and in part to protect them from damage due to mines or other dangers. Among the most recognisable of these liners, some were eventually used as troop transports, while others became hospital ships. Lusitania remained in commercial service; although bookings aboard her were by no means strong during that autumn and winter, demand was strong enough to keep her in civilian service. Economising measures were taken. One of these was the shutting down of her No. 4 boiler room to conserve coal and crew costs; this reduced her maximum speed from over 25 knots (46 km/h; 29 mph) to 21 knots (39 km/h; 24 mph). With apparent dangers evaporating, the ship's disguised paint scheme was also dropped and she was returned to civilian colours. Her name was picked out in gilt, her funnels were repainted in their traditional Cunard livery, and her superstructure was painted white again. One alteration was the addition of a bronze/gold coloured band around the base of the superstructure just above the black paint.