Original sentence: Trials were held at Misdroy from May 20–24 1944 with ranges of up to  being attained.p218  On July 4, 1944 the Misdroy gun was test fired with 8 rounds (one of the 6-foot-long shells travelled )
Edited sentence: Trials were held at Misdroy from May 20–24 1944 with ranges of up to 88 km being attained.p218  On July 4, 1944 the Misdroy gun was test fired with 8 rounds (one of the 1.8 meter long shells travelled 93 km)