Wiktionary
javelineer
n. A soldier who throws a javelin
Usage examples of "javelineer".
He preened the machine's feathered wings back, then ran forward across the hilltop with the long hopping steps of a javelineer and flung the machine skyward with a two-handed over-the-shoulder whip of his arms.
Pikes bristled and crossed in huge X shapes as they tried to face about, and crossbowmen and javelineers tried to force their way forward.