Synonyms:

sukha–happiness; duhkhe–in distress; same–in equanimity; krtva–doing so; labha-alabhau–both in loss and profit; jaya-ajayau–both in defeat and victory; tatah–thereafter; yuddhaya–for the sake of fighting; yujyasva–do fight; na–never; evam–in this way; papam–sinful reaction; avapsyasi–you will gain.

Translation:

Do thou fight for the sake of fighting, without considering happiness or distress, loss or gain, victory or defeat–and, by so doing, you shall never incur sin.