No, that's not it, it must have been something else, them blockading one of your ports or the like. Here's the list of allied cities triggering wars:

; 6a: Qarthadastim vs. Ptolemaioi (Ammonion)
; 6b: Attacks on Chersonesos (KH)
; 6c: Attacks on Byzantion (Pontos)
; 6d: Halikarnassos (Ptolemaioi)
; 6e: Kallatis (Getai)
; 6f: Qarthadastim vs. Ptolemaioi (Kyrene)
; 6g: Seleukids vs. Ptolemaioi (Kyrene)
; 6h: Nikaia (Pontos)
; 6i: Pantikapaion (KH)
; 6j: KH vs. Pontos (Sinope)
; 6k: Thermon (KH)
; 6l: Trapezous (KH)
; 6m: Qarthadastim vs. Romani (Messana)