Thor's Chariot
SG-1 felt responsible for a Goa'uld and his army on Cimmeria. They destroyed Thor's Hammer but had no way of knowing it would alert the Goa'uld that this Thor, whoever he was, was no longer minding the store.
SG-1 responded to the Sagan box being tossed through the Stargate. There they found the protective beam destroyed, many of the population dead and 3 pyramids under construction plus an battalion of Jaffa. Desperate for weapons to protect the people and defeat the Goa'uld, a trip through the Hall of Thor's Might only produced the disappearance of Gairwyn.
O'Neill was in a bind. Only four of them with decent weapons, only three military, he despaired. When he looked back at the people, at the little children, he knew he had no choice. He had to surrender. It wasn't only himself he was putting in jeopardy, he was putting his team SG-1 into the hands of the Goa'uld. This was a sentence of torture and death or worse. This overwhelming guilt of his had to be set aside while he scrambled for what to do next. If there was a next. And as soon a his team surrendered the local too would be in the hands of Heru'ur's Jaffa. They deserve to live he supposed even if it as slaves of the Goa'uld, better than dead. It was definitely a lose-lose situation.
They had tried to contact the supposed guardian of this planet, he or it was a no show.
What could 4 people do against a galactic menace? Looking at their present situation not a whole hell of a lot. Then in the blink of an eye everything changed. They had a future again, the people of this world found their guardian. And the Goa'uld Heru'ur took off through the Stargate leaving his Jaffa to who knows what. Jack would give his eye teeth to meet this formidable enemy of the Goa'uld.