 In this way, about thirty Italian boats achieved more success, though without much impact on the most critical areas of the campaign.Dönitz considered the Italians as displaying "great dash and daring in battle, often exceeding that of Germans", but less toughness, endurance and tenacity.By 30 November 1940, Italian submarines in the Atlantic each sank an average of 200 gross tons per day, while German U-boats each averaged 1,115 gross tons per day during the same period.