Simple past tense and past participle of intrude.(verb)
Intrusive.(adjective)
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Use "intruded" in a sentence
"Vietnam, NVA and Viet Cong troops again intruded on neutral Laos for sanctuary, as the Viet Minh had done during the war with the French some years before."
"South Vietnam, NVA and Viet Cong troops again intruded on neutral Laos for sanctuary, as the Viet Minh had done during the war with the French some years before."
"Chris--I wish you had "intruded"--it wouldn't have been an intrusion at all."