What are the obstacles created by the Wicked Witch of the West?

As Dorothy and Company approach the castle of the Wicked Witch of the West, the witch creates a number of obstacles for them. First, when she sees them (via the use of her one, telescopic eye) sleeping, still far off from her castle, she sends a pack of wolves to attack them, giving explicit instructions that the wolves should "tear them into small pieces." This doesn't happen, however, as the Tin Man singlehandedly decapitates all forty of the wolves.Next, the Witch sends a flock of wild crows after Dorothy and Company, telling the King Crow to "[f]ly at once to the strangers; peck out their eyes and tear them to pieces." However, this time the Scarecrow grabs each of the forty crows and breaks their necks.The Witch then sends a swarm of bees, commanding them to sting the travelers to death. But when the bees approach, the Scarecrow tells the Tin Man to tear his stuffing out and cover the others. When the bees try to sting the Tin Man, their stingers break off and they die.Next, she sends the Winkies, but when they approach the Lion roars and they run away. Finally, she sends the flying monkeys. The Monkeys tear the Scarecrow apart, drop the Tin Man over some rocks, and capture the Lion, Dorothy, and Toto, taking them all back to the castle.In the castle, the Witch confines the Lion in a cage and forces Dorothy to work. She also sets up an obstacle to try to get the silver slippers from Dorothy. One day she sets an invisible bar of iron on the floor where Dorothy is working, and Dorothy trips over it. One of the shoes comes off. This is also where Dorothy gets so mad that she throws a bucket of water on the Wicked Witch of the West, and we know what happens next.