Statistics for occurrence #1 of “Colonel Devens” in entry ball-s-bluff-battle-at of Harper's Encyclopedia of United States History:

...General McCall, which he did by making a feint of crossing the river at the two ferries above named on the afternoon of Sunday, Oct. 20. At the same time part of a Massachusetts regiment, under Colonel Devens (see Devens, Charles), was ordered to take post upon Harrison's Island, in the Potomac, abreast of Ball's Bluff. Devens went to the island with four companies in flat-boats taken from the Chesapeak...
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