Note 5 at 2 Cor. 2:14: Paul now praises God for always leading us in triumphal victory through our union with Christ Jesus our Lord. The Greek word used here for "triumph" is "thriambeuo" and is used only twice in the New Testament (2 Cor. 2:14; Col. 2:15). In Paul's day this word was associated with the triumphal procession (i.e. parade) of a victorious Roman general. When a Roman general had won a notable victory he would march his armies through the streets followed by his captives. The spoils of battle were also displayed and given to men. Censers were also carried in this parade and dispensed a pleasant aroma.

So here Paul states we share in Christ's victorious procession. Paul is also alluding to the censers of sweet aroma as being like the knowledge of Christ spreading everywhere (vv. 14-16).