The river party would break down the hillside door at the sound of a single whistle-blast, waiting and capturing anything which might issue from the regions within. At the sound of two whistle blasts it would advance through the aperture to oppose the enemy or join the rest of the raiding contingent. The party at the stone building would accept these respective signals in an analogous manner; forcing an entrance at the first, and at the second descending whatever passage into the ground might be discovered, and joining the general or focal warfare expected to take place within the caverns. A third or emergency signal of three blasts would summon the immediate reserve from its general guard duty; its twenty men dividing equally and entering the unknown depths through both farmhouse and stone building. Captain Whipple’s belief in the existence of catacombs was absolute, and he took no alternative into consideration when making his plans. He had with him a whistle of great power and shrillness and did not fear any mistaking or misunderstanding of signals. The final reserve at the landing, of course, was nearly out of the whistle’s range; hence, would require a special messenger if needed for help. Moses Brown and John Carter went with Captain Hopkins to the riverbank, while President Manning was detailed with Captain Mathewson to the stone building.