The sea is calm to-night.
The tide is full, the moon lies fair
Upon the straits; on the French coast the light
Gleams and is gone; the cliffs of England stand;
Glimmering and vast, out in the tranquil bay.
Come to the window, sweet is the night-air!
Only, from the long line of spray
Where the sea meets the moon-blanched land,
The  alliterative  “gl"s beginning this and the previous line create unity.  "Gimmering and vast …” have a grandeur that reinforces the tone of patriotism and pride.
Dover Beach