Later became an ally.

Our European allies are becoming more concerned, and China is adamantly opposed to missile defense systems.

Other journalistic and professional allies of Mr. Horner have become wary.

Many allies were becoming concerned about civilian casualties from the airstrikes and wanted to begin serious planning for a ground war.

There they became major allies and trade partners of the Comanche.

Madoc's men, in absence of any other orders, had probably assumed that the "allies" had become "enemies" and were trying to keep them from the Gate.

An ally on a new basis, becoming convinced in practical terms that his life was increasingly taking a turn for the better.

There were some who seemed instinctively to understand what the holy Kuvaz was doing, and, unlikely as it might seem, became allies of science.

As the air campaign has continued, the allies have become more willing to approve attacks on sensitive targets, like state-run television and Mr. Milosevic's homes.

According to this usage, allies become so not when concluding an alliance treaty but when struck by war.