इह here, अस्य of this, कार्यस्य of the task, पराक्रमात् ऋते other than power, विनिश्चयः a decision, कश्चित् even one, इह here, न उपपद्यते not hold good, यत् that, रणे in fight, हतप्रवीराः slay a few heroes, राक्षसाः ogres, अद्य to day, इह here, कथञ्चित् somehow, मार्दवम् soften, ईयुः will yield.

'Other than power, there is no way to accomplish the task of ascertaining their strength. If I slay a few strong ogres somehow they may soften a little and yield.