This is the 683rd most frequent Turkish word.
ordusunun
"Of his/her/its army" or "of their army."
The word 'ordusunun' is used here to denote possession, indicating that the army ('ordu') belongs to the king.
Kral, ordusunun başarısıyla gurur duydu.
The king was proud of his army's success.
Here, 'ordusunun' signifies possession, attributing the morale to the specified army.
Ordusunun morali zaferden sonra çok yükseldi.
The morale of his army increased greatly after the victory.
In this case, 'ordusunun' demonstrates possession, associating the orderly advance with the army commanded by the general.