Statistics for occurrence #1 of “General Grant” in chapter 40 of Admiral David D. Porter, The Naval History of the Civil War.:

...ichmond would be altogether military, and as the naval forces could not get to that city with the land and naval batteries opposed to them, the obstruction proposal was decided upon. At that time General Grant was expected to cross the James and operate against Richmond from the south side, and, under the circumstances, it was absolutely necessary to hold the river secure against the contingencies of a nav...
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