The battle by the river Kaikos, which is also mentioned in OGIS_276, was clearly the occasion when Attalos decisively defeated the Galatians - a victory that was 'the greatest of his achievements' ( Paus_1.8'1 ). For an explanation of how this inscription relates to the other dedications made by Attalos in the temple of Athena at Pergamon, see B.S.Ridgway, "Hellenistic Sculpture", vol.1 pp. 284-287 ( Google Books ).
[King Attalos dedicated] this thank-offering to Athena, [after defeating] the Tolistoagian [Galatians] in battle by [the source] of [the river] Kaikos.
Attalus' home page | 10.11.16 | Any comments?