What are the obstacles that Eliza faced while her escape. How did she carefully overcome them?

With her son still asleep in her arms, Eliza runs from Uncle Tom's cabin in the general direction of the North. She is able to carry on until daylight, for fear has made her "flesh and nerves impregnable." She recognizes her surroundings, far away from the Shelby plantation, from her travels with Mrs. Shelby, and realizes that she will have to cross the Ohio River to reach the North.

Because it is now morning, Eliza must slow her pace to avoid suspicion. She and Harry walk all day, stopping only so that Harry can eat (Eliza is too choked with fear to even swallow), and finally they reach the river at sunset. The river is swollen with "great cakes of floating ice swinging heavily to and fro in the turbid waters." Because there is no ferry, Eliza must cross the ice, but first she accepts dinner and a bed to rest from a woman who runs the local tavern. Harry sleeps as his mother gazes through the window at the violent waters in a panic.