The need to protect shipping using the channel has also led to the development of the lighthouses, which are prominent landmarks.

And there is a suspicion that the fleet's role is not limited to protecting international shipping.

Supporters argued that a navy would protect shipping, defend the coast, and make it easier to seek out support from foreign countries.

By 1787 Congress was unable to protect manufacturing and shipping.

Both claimed the Baltic as theirs, and promised to protect foreign shipping.

She patrolled off the island to protect shipping and providing direct support to the landings.

The rest had sailed north to protect shipping and fight the so- called piracy.

It's a purely symbolic statement that we will try to protect shipping, but its effectiveness is low.

She continued to protect American shipping through the late summer and fall.

She made another trip to Iceland on 28 September, and spent the next two months there protecting shipping.