Author’s Purpose You Do - A formative assessmentAn excerpt from It Happened in Washington by James CrutchfieldPrior Knowledge: The Columbia River was said to “guard the west.” To the north and east “stretched a wide expanse of never- ending plains;” And to the south, the foothills of the Blue Mountains protected the location.
The outside of the wall was made very smooth to keep the enemy from climbing it.
On the inside, a strong gallery five feet wide, extended all around.
At each corner was a reservoir that held two hundred gallons of water as a security against fir.
The outer gate was cleverly made to open and shut by a pulley, and two double doo...
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