The Squadron of Evolution—sometimes referred to as the "White Squadron"— was a transitional unit in the United States Navy during the late 19th century. It was probably inspired by the French "Escadre d'évolution" of the 18th and 19th centuries. The squadron was composed of the protected cruisers , , , and dispatch boats and . Yorktown′s sister ships and joined the squadron in 1891. Rear Admiral John G. Walker served as its Commander with Chicago as his flagship. Walker was a proponent of the relatively new practice of concentrating ships into formations controlled by a single commander, and used his position to carry out exercises in squadron tactics, ship-to-ship signalling, and landing operations. Having both full rigged masts and steam engines, the White Squadron was also influential in the beginning of steel shipbuilding in the United States. Following a period of sea trials in the fall of 1889, the squadron was first set underway from New York on November 18, 1889. After being displayed at a public maritime celebration in Boston, the squadron sailed to Lisbon, Portugal, where Walker was received by the Portuguese government and conducted exercises to determine his ships' ability to execute coordinated maneuvers under steam. On January 17, 1890, the squadron called at Cartagena, Spain, where the vessels were toured by Spanish authorities, who gave "their favorable opinions regarding the handsome construction, clean state, and the latest sea and war improvements and perfect order of the four ships." After stops at Mahón, Toulon, Villefranche, and Spezia, the squadron headed to Corfu, where Walker carried out target practice and landing exercises. The White Squadron remained in the Mediterranean until leaving for Algiers on April 30. After arriving there, Walker received a telegram ordering the squadron to head across the Atlantic to Brazil in order to support U.S. interests there following the recent military coup. After arriving there, and being greeted with ceremony by representatives of the new government, the squadron turned back to the United States, returning to New York on July 1890. In 1891, the White Squadron commenced a tour of the Great Lakes, which was commemorated in an album by Woolson Spice Co. At that time, the White Squadron consisted of the cruiser under the command of Captain Frederick Rodgers, under the command of Captain George C. Remey, under the command of Captain Winfield S. Schley, under the command of Captain Gilbert C. Wise, under