Your younger brother (Arjuna), O Bhimasena, is returning with the horse. I have learnt this from those men who had followed Arjuna.
आयाति भीमसेनासौ सहाश्वेन तवानुजः। यथा मे पुरुषाः प्राहुर्ये धनंजयसारिणः॥