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As originally built, Battery Quarles, Battery Randol and Battery Ash were a part of a larger seven gun unnamed battery that contained five 10" and two 12" guns, all in Barbette carriages. This was the original "main gun line" located on the top of Artillery Hill. These batteries were all accepted for service on 16 Jun 1902 shortly after the Fort was first garrisoned. The total cost for the three batteries came to $ 232,554.97 (not including guns and carriages).

The batteries were all named in 1904. In 1909 a significant structural upgrade was undertaken on the main gun line. The original 4-2-1 configuration of four 10" guns, two 12" guns and one 10" gun had been changed by swapping the last 10" gun with the first 12" gun to produce a 5-2 configuration. The final configuration had the emplacements as Battery Randol with two 10" guns, Battery Quarles next with three 10" guns and Battery Ash last with two 12" guns. The cost of modifications to the three batteries had reached $50,215.00 by the end of 1909.

Battery Benson was added to the "main gun line" located on the top of Artillery Hill in 1908 with two more 10" guns. These guns were more modern and had disappearing carriages not the Barbette mounts of the initial emplacements. The addition of Battery Benson (and several other batteries) improved coverage of the Straight of Juan de Fuca to the North and West.