Why does Oliver wish for the horn to be blown in Song of Roland?

In "The Song of Roland," Oliver wishes for the horn to be blown to summon help for the beleaguered Frankish forces, recognizing the dire situation they face against overwhelming odds. He understands that sounding the horn, the Olifant, would alert Charlemagne and reinforcements to their plight, potentially turning the tide of battle. Oliver's desire reflects his loyalty to his comrades and his strategic thinking, as he prioritizes their survival over personal pride. Ultimately, it underscores the themes of brotherhood and sacrifice in the epic.