 The War Office and the Army were concluding , at this point , that light tanks were a liability and too vulnerable for use in further combat , and the Tetrarch was considered to be obsolete . This decision may have marked the end for the Tetrarch in active service ; several of the tanks destined to be deployed to the Eighth Army in the Middle East for the North African Campaign were left in Britain when their cooling systems were determined to be unable to cope with the intense North African heat . 
 The War Office and the Army <a href='uninflect' title='1'><mark>were</mark></a> concluding , at this point , that light tanks <a href='uninflect' title='2'><mark>were</mark></a> a liability and too vulnerable for use in further combat , and the Tetrarch was considered to be obsolete . This decision may <a href='been_done' title='3'><mark>have</mark></a> marked the end for the Tetrarch in active service ; several of the tanks destined to be deployed to the Eighth Army in the Middle East for the North African Campaign <a href='uninflect' title='4'><mark>were</mark></a> left in Britain when their cooling systems <a href='uninflect' title='5'><mark>were</mark></a> determined to be unable to cope with the intense North African heat . 
The War Office and da Army was concluding , at this point , dat light tanks was a liability and too vulnerable for use in further combat , and tdaTetrarch was considered to be obsolete . This decision may done marked the end fa the Tetrarch in active service ; several of thdaanks destined to be deployed to the Eighth Army in the Middle East for the North African Campaign was left in Britain when their cooling systems was determined to be unable to cope with the intense North African heat .