Sayyiduna Ubadah bin al-Samit (may Allah be pleased with him) said: At the beginning of a military expedition the Messenger of Allah (peace and blessings be upon him) used to give a quarter, and when he returned, a third.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12804