You searched for: “massed
massed, mast
massed (MAS't) (verb)
Accumulated or gathered together: The bands massed in the park before the start of the parade.
mast (MAST) (noun)
A tall vertical spar, sometimes sectioned, that rises from the keel or deck of a sailing vessel to support the sails and the standing and running rigging: The tree that the builder used for the mast was a special pine grown in North America.

The tall mast ships massed in the harbor for the special historical anniversary.