Rick Renner:

The victory has already been won; there is nothing we can add to the destructive work Jesus did to Satan’s domain when He was raised from the dead.
In Colossians 2:15, Paul vividly portrays Jesus’ victory and Satan’s defeat. It says, “And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.” Especially notice the word “spoiled.” This word is taken from the Greek word apekdusamenos, and it refers to the act of stripping one's garments off to the point of complete nakedness.
We must be careful to remember that the real battle with Satan was won at the Cross and the resurrection.
By using the word “spoiled,” the Holy Spirit tells us that when Jesus Christ arose from the dead, He thoroughly plundered the enemy. Quite literally, He “spoiled principalities and powers.” An even better translation could read, “He completely stripped principalities and powers and left them utterly naked, with nothing left at their disposal to retaliate.”
Furthermore, Paul goes on to tell us that Jesus didn’t stop when His mission was accomplished and His sacking and plundering of hell’s powers was complete. Instead, Jesus rubbed this defeat in the devil’s face by throwing the biggest party the universe had ever seen!
Colossians 2:15 continues, “And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.” The word “shew” is taken from the word deigmatidzo, and it literally means to display or to expose something. It was used in classical Greek writings to denote the display of captives, weaponry, and trophies that were seized during war on foreign soil.
Once the war was over and the battle was won, the reigning emperor would return home and victoriously display and expose the treasures, trophies, weaponry, and captives he had seized during his military conquest. This was a grand moment of celebration for the victor — and a very humiliating experience for the defunct foe!
Now the Holy Spirit has carefully chosen to use this same word (deigmatidzo) to let us know what Jesus did after He was finished plundering the enemy. When His resurrection was complete and the enemy was stripped bare to the core, Jesus then proceeded to publicly display and expose this defeated spiritual foe and all his defective wares to the hosts of Heaven!
But wait — there is still more to Colossians 2:15 we must understand. Paul goes on to tell us that “. he made a shew of them openly....”
Especially pay heed to the word “openly.” The word “openly” is taken from the word parresia, which is used throughout the books of the New Testament to denote boldness or confidence.
By using the word parresia, Paul declares that when this heavenly party or celebration of Jesus’ victory commenced, it was no quiet affair. Quite the contrary! Jesus boldly, confidently, and loudly exposed and displayed this now-defunct foe to Heaven’s hosts!
Make no mistake about it — when Jesus made a “shew of them openly,” it was not a quiet moment in Heaven. Jesus made a display of these defeated enemies and their defective wares openly, boldly, confidently — and, yes, even loudly! In other words, this was quite a show!
Then the verse continues: “...He made a shew of them openly, triumphing over them in it.” The word “triumphing” is taken from the Greek word triambeuo, which is a technical word used to describe a general or an emperor returning home from a grand victory in the enemy's territory. The word “triumph” (triambeuo) was a word used to specifically describe the emperor’s triumphal parade when he returned home. (For more on this, see Chapter Nine in my book, Living in the Combat Zone.)
Colossians 2:15 explicitly teaches that when Jesus’ work on the Cross was finished, He descended into the lower places in order to take the enemy apart piece by piece. Jesus thoroughly “spoiled principalities and powers” through His death and resurrection. They were so utterly plundered that they were “stripped to bare nakedness” and left with nothing in hand to retaliate!