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<p>Lost should be had lost. (past perfect)
Past Perfect expresses the idea that something occurred before another action in the past. It can also show that something happened before a specific time in the past.
Check out this page for detailed explanation of past perfect.
[ENGLISH</a> PAGE - Past Perfect](<a href=“http://www.englishpage.com/verbpage/pastperfect.html]ENGLISH”>Past Perfect Tense | ENGLISH PAGE)</p>
<p>Also, “was losing” is past continuous.
[ENGLISH</a> PAGE - Past Continuous](<a href=“http://www.englishpage.com/verbpage/pastcontinuous.html]ENGLISH”>Past Continuous Tense | ENGLISH PAGE)</p>
<p>This website explains different tenses very well.</p>