Lord Sovereign
The resident Britbong
Imma strongly advise you go grab a pillow, because you'll probably want to scream into it when you read the rest of this post.
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According to Disney Canon there was at least one Star Destroyer just off screen we couldn't see helping to kill the Rebel fighters, possibly several.
If the DS-1 had a navy escort, the Rebels would have just tried to run. There'd be no way in hell that they could get close enough to attack the main station, let alone the thermal exhaust port. Point defence and picket squadrons would slag them in short order.
The Death Star was lost as much from Tarkin's arrogance as Rebel tenacity.
Then again, this is Disney. The same company that seems to think twenty four fighters and bombers can take on eight Imperial Star Destroyers. Yes, the so called battle of Lothal makes me irrationally angry, how did you tell?