Satan and his evil forces are mentioned as in Ephesians 6
12 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
At the time of Christ’s crucifixion,
15 And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.
1 John 3:8
8 He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil.
satan was defeated at the time of Christ’s crucifixion and when Christ had disarmed the rulers and authorities, He made a public display of them, having triumphed over them.