During their conversation, which Joe overheard, Boston Frank mentioned to Slippery that the "P.-O." had been reported to be a regular mint, and he repeatedly assured him that no one was sleeping in the "P.-O." as he had tried several nights in succession to purchase tobacco at the "P.-O.", but his knocks were not answered. At a cross-roads country store they stopped and here Joe understood what Boston Frank had meant with "P.-O.", as it bore a large sign that had the words "Post Office" painted upon it. While Boston Frank hitched the horse and buggy to a nearby tree, Slippery carried the heavy satchels containing the tools to the rear of the store, while he ordered Joe to carefully unwrap the nitro-glycerine bottle from his leg, which the boy gladly did to be rid of the dangerous explosive, and then handed it to Slippery. Joe, who had not yet the least inkling what sort of mysterious night work was contemplated by his older companions, suddenly came to the realization of his own danger when Slippery in a decidedly unfriendly manner, roughly commanded him to stand guard in front of the store, and after he had placed the lad so he could scan the different roads, he did something that has made more blood thirsty desperadoes out of harmless boys than any other trick, he pressed a cocked, large calibered revolver into the unsuspecting boy's hand and curtly ordered him, under pain of losing his own life if he failed to obey this order, to blaze away at any approaching human being. Then he disappeared towards the rear of the building.