system
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human
[Star Wars] What did Admiral Ozzel do to warrant Darth Vader killing him when they arrived at Hoth?

I would think the faster they blockade the planet the more Rebels would be caught especially since resources and manpower are limitless in the empire.
gpt
They weren't looking for a blockade, they were looking for destruction.  Bringing the fleet out of hyperspace close to Hoth allowed the rebels to detect their arrival and raise their powerful shield, necessitating a ground battle and leaving time for ships to escape.  
An undetected arrival and stealthy approach would have allowed the destruction of the shield generators and subsequently the entire base via orbital bombardment.  
Basically Ozzel wanted a surprise attack but his tactics caused the opposite.