It is an old custom amongst Jewish children, to become war-like on the 'L'ag Beomer.' They arm themselves from head to foot with wooden swords, pop-guns and bows and arrows. They take food with them, and go off to wage war.
Other quotes by Sholom Aleichem
Remember, you must not sleep at the Seder. If you do, Elijah the Prophet will come with a bag on his shoulders. On the two first nights of Passover, Elijah the Prophet goes about looking for those who have fallen asleep at the Seder, and takes them away in his bag.