Buster Beaker explains how high and low tides are affected by the gravity of the moon and the sun. He illustrates the phenomenon using a cookie, a mushroom, and a lemon.
It is described how many tribes were drawn to live near the Nile River, and how these were united to form Egypt under Menes. The narrator then describes how canals were built, and how they became ancient Egypt's main system of transport. It is then detailed how ancient Egyptians took advantage of canals and what particular commodities were transported through the canals.
Colonel Shaw commends Private Trip on his fighting yesterday. He offers to honor the Private by allowing him to bear the regimental colors. Private Trip indicates that he is not fighting for the Colonel and expresses concern that, even after the war, he and his people will not benefit if they win.