If the trench should be successfully taken and all the enemy disposed of, the first work to be done is to "reverse" it, and connect it up by communicating trenches with the old position. For this work engineers are sent immediately behind the infantry, and they carry with them quantities of sand bags and shovels and picks and wire, etc., with which to complete this task. Of course the infantry must also help, and for this purpose it will be as well for each man to take with him a few sandbags on his back--not enough to encumber him, but sufficient to be of service in putting up hasty defences. The test of the success of the action will come as soon as the enemy is able to organise a counter-attack. He will know the range of the trench to a nicety and will not be slow to hurl the weight of his shells against it. Then, too, he will try to bring up reserves, who with bayonet and bomb will attack their old position. For many weary hours the infantry may be busy on this task of repelling counter attacks, and consolidating their new position. So many details have to be cared for in an attack that it is well to rehearse it thoroughly beforehand and to see that every individual knows just exactly where he is supposed to be and what he is to do. Only in that way will confusion be avoided. It will be necessary also for the attackers to wear distinguishing marks in the form of a white band on the arm or a white piece of cloth on the back if the attack is to be made in the darkness or with poor light.