Wholly unlike these, genuinely and solely a product of Keilhau, was the great battle-game which we called Bergwacht, one of my brightest memories of those years. Long preparations were needed, and these, too, were delightful. On the wooded plain at the summit of the Kolm, a mountain which belonged mainly to the institute, war was waged during the summer every Saturday evening until far into the night, whenever the weather was fine, which does not happen too often in Thuringia. The whole body of pupils was divided into three, afterwards into four sections, each of which had its own citadel. After two had declared war against two others, the battle raged until one party captured the strongholds of the other. This was done as soon as a combatant had set foot on the hearth of a hostile fortress. The battle itself was fought with stakes blunted at the tops. Every one touched by the weapon of an enemy must declare himself a prisoner. To admit this, whenever it happened, was a point of honour. In order to keep all the combatants in action, a fourth division was added soon after our arrival, and of course it was necessary to build a strong hold like the others. This consisted of a hut with a stone roof, in which fifteen or twenty boys could easily find room and rest, a strong wall which protected us up to our foreheads, and surrounded the front of the citadel in a semicircle, as well as a large altar-like hearth which rose in the midst of the semicircular space surrounded by the wall. We built this fortress ourselves, except that our teacher of handicrafts, the sapper Sabum, sometimes gave us a hint. The first thing was to mark out the plan, then with the aid of levers pry the rocks out of the fields, and by means of a two-wheeled cart convey them to the site chosen, fit them neatly together, stuff the interstices with moss, and finally put on a roof made of pine logs which we felled ourselves, earth, moss, and branches. How quickly we learned to use the plummet, take levels, hew the stone, wield the axes! And what a delight it was when the work was finished and we saw our own building! Perhaps we might not have accomplished it without the sapper, but every boy believed that if he were cast, like Robinson Crusoe, on a desert island, he could build a hut of his own. As soon as this citadel was completed, preparations for the impending battle were made. The walls and encircling walls of all were prepared, and we were drilled in the use of the poles. This, too, afforded us the utmost pleasure. Touching the head of an enemy was strictly prohibited; yet many a slight wound was given while fighting in the gloom of the woods.