Marching
The participle is marching.
the marching band was as loud as a train horn.
Marching soldiers will step simultaneously.
stomping down to their boats on the sad shore
The brass band passed by, marching four abreast.
The Macy's Thanksgiving day parade is a cavalcade of floats, marching bands, and performance artists.
abreast - side by side The parade had six drummers marching abreast.
Marching
As the soldiers jumped from the helicopter: The whooshing blades tried to blow them about as they were marching out.
The old crucifer (= cross-bearer or carrier) was marching slowly towards the cathedral.
The nouns in the sentence are: hearing armies ants