We called roll and found that fortunately seventy percent of the men were inside the blockade line.

They formed a perfect blockade line between the tents and the colony beyond.

However, loopholes were found in the southern end of the blockade line.

The two teams split up, veering toward the closing pincers of the blockade line.

This opened a gap in the western portion of the American blockade line, leaving a window for Cervera.

"We're through the blockade line, Captain," the sonar man announced finally.

There's no way we can sneak out of the blockade line, and no chance of breaking out, either.

The US made a final visual check as each of the ships passed the blockade line.

Other nationalist forces mobilized to build and man the blockade lines.

But when we got through into our own space, we weren't able to bypass the robot fleet's blockade lines.