The river crossing
On April 11, Houston received the Twin Sisters, two small cannons sent by the citizens of Cincinnati, Ohio. At 10 o’clock on the morning of April 12, Houston’s men began filing aboard the Yellow Stone. By the next day, more than 700 soldiers, 200 horses and supplies had been ferried across the swollen Brazos River in seven trips aboard the ship. Once across the eastern bank of the river, Houston and his army set off for their march to the Gulf.
Information taken from http://www.forttumbleweed.net/steamboats.