ComradeP got me on this one. I became too much focused on avoiding the casualties in the city when being bombarded from the other bank and later distracted by his counterattack from the north after crossing the river, which I became aware of just in time to defend the northern-most objective, that I completely forgot about the most important 500pts objective in the city of Sabac itself.
S14 : 1914_0821_01: A Matter of Honor 
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Prior to that, it was a draw on loss points after IV Korps had crossed the Sava unseen south of Drenovac.