"And therefore, throughout Islamic history, the month of Ramadan witnessed the greatest conquests, which were an important factor in Islam's expansion to the entire world by means of its tolerance and justice. Additionally, Ramadan witnessed many events that went down in history as remarkable milestones in [the development of] Islamic culture.
"On 22 Ramadan in the first year of the Hijra, the Prophet's raids began, including the raid of Hamza bin 'Abd Al-Muttalib, the raid of Muhammad bin Maslamah, and other raids that helped support the foundations of Islam. [These continued] until 17 Ramadan in the second year of the Hijra, in which the great Battle of Badr took place, which saw the Muslims, under the command of the Messenger of Allah (pbuh), triumph over the large armies of unbelief.
"[On 21] Ramadan in the eighth year of the Hijra, the Messenger of Allah (pbuh) and his companions conquered Mecca. This conquest was a crowning achievement for the efforts of the Prophet (pbuh) in da'wa for the sake of Allah and in bringing the rule of Islam to the Arabian Peninsula, and led groups of people to convert to Islam. On 8 Ramadan in the ninth year of the Hijra, the Battle of Tabouk took place. The Messenger (pbuh) returned from this battle on the 26th of that month, after Allah the Almighty had aided him greatly. After the death [of the Prophet Muhammad] (pbuh), his Companions, may God's will be upon them, continued his path in spreading Islam.
"In the [Companions'] days, Ramadan was also witness to many great Islamic conquests. On 13 Ramadan in the 15th year of the Hijra, the leader of the believers, 'Omar bin Al-Khattab, may God's will be upon him, arrived in Palestine after fierce battles to conquer the Levant, having already received the keys to Jerusalem which we ask Allah to return in its entirety to the Muslims and wrote a contract for its residents guaranteeing their lives and property.
"On 1 Ramadan in the 20th year of the Hijra, the Muslims, under the command of the general 'Amr bin Al-'As, may God's will be upon him, entered Egypt. This was during [the reign] of the Leader of the Believers, 'Omar bin Al-Khattab, may God's will be upon him, after 'Amr vanquished the oppressing Byzantine soldiers on his way.
"On 6 Ramadan 63, Muhammad bin Al-Qasim defeated the Indian armies on the Sind River and conquered India. This was at the end of the [reign] of [the Umayyad Caliph] Al-Walid bin 'Abd Al-Malik.
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http://www.memri.org/report/en/0/0/0/0/0/0/8661.htm