Personally think the mc is stupid builds a defensive base with no sensor equipment in 5 years and doesn't look into the race he is protecting to see there cultures or to see if they would accidentally find him no matter how powerful the future enemy is, or watch the fight betweenhim and the enemy. Know ur surroundings to even the playing field is how the mc thinks but doesn't use it.
Silver Lining
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LIKEUgh, I typed out a lot of words insulting your reply but didn’t feel like being to rude so I’ll leave you with this, to win a battle knowledge about the terrain is one of the most important factors, if you don’t know it then a lot of mistakes can happen.
Vhok:his system tells him exactly how long until the first alien attack fleet will arrive so he had no need for sensors until that time is drawing closer.