King (Raja) Kaka reorganized his army in a few days and joined Muhammad ibn al-Qasim.
From here Muhammad ibn al-Qasim turned towards Brahmanabad and encamped on the bank of the river a few kos away from Brahmanabad.
Here he spent a few days preparing to cross the river.
At this stage, Saad (Gangu) proved to be a great help to him. His companions reached the distant fishing villages along the river with the news of the arrival of the savior of Sindh, and in a few days many sailors gathered with their boats to help Muhammad ibn al-Qasim, but before crossing the river,
Muhammad ibn al-Qasim, An epidemic broke out among Muhammad ibn al-Qasim's horses and within a few days a significant number of horses died.
As soon as Hajjaj ibn Yusuf heard this news, he sent two thousand camels loaded with vinegar from Basra and this vinegar proved to be useful for this dangerous disease. In June 713A.D, Muhammad ibn al-Qasim crossed the Indus River without facing any resistance.
In addition to nearly two hundred elephants, King (Raja) Dahir had added to his army fifty thousand cavalry and many infantry.
In the last days of June the river was at its peak and it was not expected that Muhammad ibn al-Qasim would be so diligent in crossing it.
He immediately ordered his army to advance and encamped at a distance of two kos from Muhammad ibn al-Qasim's camp.
For a few days, there were minor skirmishes between the patrols of the two forces
Finally one evening Muhammad ibn al-Qasim decided to fight a decisive battle.
After Isha prayer at night, he wrote a letter to his wife in the light of a torch and handed it over to the messenger.
May God give you the determination and courage of a mujahid's wife. In the morning I am going to fight a decisive battle with the numerous army of the enemy, and before this letter reaches your hands the fate of Sind will be decided. My heart testifies that God will give me victory. I am proud of my soldiers, and more than these soldiers, I am proud of the Arab mothers whose milk is running in their veins as blood, who told them the stories of Badr and Wahneen while giving them poems in their childhood.
I am proud of those wives whose sense of duty has taught their husbands to wish for the lives of soldiers and the death of martyrs. Whose love, instead of putting chains on their feet, has taught them the lesson of conquering the world and I am satisfied that they will not allow the flag of Islam to fall until the last drop of blood is left in the veins of these soliders.
I was never worried about your and mother's separation. I am not oblivious to your memory, but when I see thousands of young people with me who are enduring the separation of their wives, mothers and other loved ones with patience and gratitude in the path of God, I am very happy. I am also one of them
The mothers of some of the youths who have been martyred in the previous wars have written to me asking that their sons' blood did not fall on their heels and if I am martyred, I expect that my mother will also die on my heels. Will ask the same question to colleagues.
I have promised you that until the widows and orphans are freed, I will not slow down and I will keep this promise and you have promised me that you are my martyrdom. But no tears will flow. You also fulfill your promise.
Saying my polite greetings to mom.
I am writing a separate letter to her.
Your Muhammad"
After writing the second letter to his mother, Muhammad bin Qasim got busy looking at the map of the battlefield.