The deeper British grievance was their perception that Napoleon was taking personal control of Europe, making the international system unstable, and forcing Britain to the sidelines. Numerous scholars have argued that Napoleon's aggressive posture made him enemies and cost him potential allies. As late as 1808, the continental powers affirmed most of his gains and titles, but the continuing conflict with Britain led him to start the Peninsular War and the invasion of Russia, which many scholars see as a dramatic miscalculation.