The "Queen's Regulations" are very precise as to the hoisting of the flag at the various home and foreign stations and fortresses. Some few of these have the Royal Standard for use on Royal Anniversaries and State occasions only, and these flags are issued in two sizes--either twenty-four by twelve feet, or twelve by six feet--according to the importance of the position; thus Dover, Plymouth, and the Tower of London, for example, have the larger size. In like manner the Union Flag is of two sizes: twelve by six feet, or six by three feet. These flags at the various stations are either hoisted on anniversaries only, or on Sundays in addition, or else daily; thus Dover, besides its Standard, has a Union flag, twelve by six, for special occasions, and another, six by three, {55} which is hoisted daily. Our foreign stations, Bermuda, Cape of Good Hope, Cyprus, Gibraltar, Hong Kong, Halifax, St. Helena, and so forth, are all equally rigidly provided for in Regulations. There is no option anywhere in the matter. A particular fortress has to fly a particular flag of a particular size on a particular day. The white ensign, Fig. 95, is the distinguishing flag of the Royal Navy. It is hoisted at the peak of all vessels in commission, or in such other conspicuous position of honour as their rig or (as in the case of some ironclads) absence of rig will permit. It is a large white flag, having upon it the Cross of St. George, the portion of the flag nearest the mast-head being occupied by the Union.[41] Until 1864 the Royal Navy was divided into the white, the blue, and the red squadrons, distinguished by the flags shown in Figs. 95, 96, and 97, but this arrangement, though it had lasted for over two hundred years,[42] was found to have many inconveniences. It was very puzzling to foreigners, and it was necessary that each vessel should have three sets of colours, so as to be able to hoist the orthodox flag for the squadron in which, for the time being, it might be placed. It was also a difficulty that peaceful merchantmen were carrying a red ensign, Fig. 97, exactly similar to the war flag of the vessels of the red squadron. It was inconvenient in action, too; hence, Nelson at Trafalgar ordered the whole of his fleet to hoist the white ensign. An Order of Council, dated October 18th, 1864, put an end to this use of differing flags, declaring that henceforth the white ensign alone should be the flag of the Royal Navy. In the old days the red was the highest, the white the intermediate, and the blue the third in rank and dignity.