If at a halt, or if marching in quick time, the command _double time_ precedes the command of execution. 12. In successive movements executed in double time the leading or base unit marches in _quick time_ when not otherwise prescribed; the other units march in _double time_ to their places in the formation ordered and then conform to the gait of the leading or base unit. If marching in double time, the command _double time_ is omitted. The leading or base unit marches in _quick time_; the other units continue at double time to their places in the formation ordered and then conform to the gait of the leading or base unit. 13. To hasten the execution of a movement begun in quick time, the command: 1. _Double time_, 2. _MARCH_, is given. The leading or base unit continues to march in quick time, or remains at halt if already halted; the other units complete the execution of the movement in double time and then conform to the gait of the leading or base unit. 14. To stay the execution of a movement when marching, for the correction of errors, the command: 1. _In place_, 2. _HALT_, is given. All halt and stand fast, without changing the position of the pieces. To resume the movement the command: 1. _Resume_, 2. _MARCH_, is given. 15. To revoke a preparatory command, or, being at a halt, to begin anew a movement improperly begun, the command, _AS YOU WERE_, is given, at which the movement ceases and the former position is resumed. 16. Unless otherwise announced, the guide of a company or subdivision of a company in line is _right_; of a battalion in line or line of subdivisions or of a deployed line, _center_; of a rank in column of squads, toward the side of the guide of the company. To march with guide other than as prescribed above, or to change the guide: _Guide (right, left_, or _center)_. In successive formations into line, the guide is toward the point of rest; in platoons or larger subdivisions it is so announced. The announcement of the guide, when given in connection with a movement, follows the command of execution for that movement. Exception: 1. _As skirmishers, guide right (left_ or _center)_, 2. _MARCH_. (_C.I.D.R., No. 2._) 17. _The turn on the fixed pivot_ by subdivisions is used in all formations from line into column and the reverse. _The turn on the moving pivot_ is used by subdivisions of a column in executing changes of direction. 18. Partial changes of direction may be executed: By interpolating in the preparatory command the word _half_, as _Column half right (left)_, or _Right (left) half turn_. A change of direction of 45 deg. is executed. By the command: _INCLINE TO THE RIGHT (LEFT)_. The guide, or guiding element, moves in the indicated direction and the remainder of the command conforms. This movement effects slight changes of direction.