I managed to make a sufaced attack at night in similar conditions and was able to run at flank speed until I got to within 1500m of the target before I went slow for the final attack run.
IIRC conditions were Overcast, No rain, Wind speed 15m/s and Moderate visibility. If the sky is clear and there is a moon, work out if it is likely to set whilst it is still dark and wait until it has set before attacking on the surface.
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