Hadith Bukhari leaving Home for peaceful Dawah other Than War in Jihad

Q1. Whether it is proved from Sahaba that they left there home for long time for peaceful Dawah other than for War in Jihad.

Hadith on sending Individual or group for preaching other than war Mission for peaceful preaching of Dawah Tabligh and Islah.

It is fairly obvious that there is nothing wrong with visiting Muslims as a group to teach them their Deen,

These 2 Narrations in Bukhari and Muslim gives a direct example i.e  Mu'adh & grandfatherof  Sa'd b. Abu Burda Raziallahu for Yemen and  seventy Sahaba to the tribes of Ril, Dhakwan, 'Usiya and Bani Lihyan
1. It has also been narrated by Sa'd b. Abu Burda through his father through his grandfather that the Prophet of Allah (may peace be upon him) sent him and Mu'adh (on a mission) to the Yemen, and said (by way of advising them): Show leniency (to the people) ; don't be hard upon them; give them glad tidings (of Divine favours in this world and the Hereafter) ; and do not create aversion. Work in collaboration and don't be divided.

2. Narrated Anas:  The people of the tribes of Ril, Dhakwan, 'Usiya and Bani Lihyan came to the Prophet and claimed that they had embraced Islam, and they requested him to support them with some men to fight their own people. The Prophet supported them with seventy men from the Ansar whom we used to call Al-Qurra'(i.e. Scholars) who (out of piety) used to cut wood during the day and pray all the night. So, those people took the (seventy) men till they reached a place called Bi'r-Ma'ana where they betrayed and martyred them. So, the Prophet invoked evil on the tribe of Ril, Dhakwan and Bani Lihyan for one month in the prayer.

Sahaba Spreaded Islam to Large Part of the World…By means of??
Sahaba spreaded Islam to Remote corner of the world. Their mission was spread of message of Allah and not for the conquest. There is no two opinion that for the spread of the peaceful message of Allah if needed war has been mandated and Sahaba fought that also, and till Qiyamat these command of Allah is en force.

But some Orientalist historian (Mushtashriqeen) always misprojected Sahaba as warrior. Their peaceful missions were not highlighted in history. Even at the time war their approach was not highlighted.
More or less it has affected Muslims intellectuals and historian and and many of the Muslims think on that line.
With we talk about spread of Islam in our mind only comes the picture of Iran Rome Syria etc. victories and we totally forget So many other countries and areas where no battle was fought and Islam.
The Daees of Islam went to these Places and countries for peaceful Dawah. E.g.
1. Indonesia and Malaysia.
Indonesia is a country that has the maximum number of Muslims in the world.The majority of people in Malaysia are Muslims. May one ask, “Which Muslim army went to Indonesia and Malaysia?”
2. East Coast of Africa.
Similarly, Islam has spread rapidly on the East Coast of Africa. One may again ask, if Islam was spread by the sword, “Which Muslim army went to the East Coast of Africa?”
3. Southern Indian states of kerala
In Kerala Islam came even before north India even much before Muhammad bin Qasim. No muslim Army came here rather historical evidences suggest that Sahaba Jamaat came here. And Some sahaba graves are also reported in kerala Malabar Region. In this Malabar region of Kerala 40-80% population is Muslim in different districts.
Even at the time of  War…(e.g of Iran War)
If you get detail history, their has been full Dawah to king Rustam before battle. There went at least three delegation of Sahaba on different days and gave Dawah of Islam to king Rusatm before Battle of Qaadisiyyah. These delegation were 
1.    Hadhrat Nu'maan bin Muqarrin The group included Hadhrat Nu'maan bin Muqarrin,Hadhrat Furaat bin Hayyaan, Hadhrat Handhala bin Rabee Tameemi, Hadhrat Utaarid bin Haajib, Hadhrat Ash'ath bin Qais, Hadhrat Mughiera bin Shu'ba and Hadhrat Amr bin Ma'dikarib  (Ibn Katheer in his AIBidaaya wan Nihaaya (Vol.7 Pg.38).
2.    Hadhrat Mughiera bin Shu'ba
3.    Hadhrat Rib'ee bin Aamir
4.    The next day, the Persians asked for another person and Hadhrat Sa'd sent Hadhrat Hudhayfa bin Mihsin to addressed them in the manner that Hadhrat Rib'ee did.
(Bidaaya wan Nihaaya (Vo1.7 Pg.38). Tabari (Vo1.4 Pg.105) has $so narrated it and mentioned the detailed Da'wah that Hadhrat Zuhra, Hadhrat Mughiera, Hadhrat Rib'ee and Hadhrat Hudhayfa g ave .
Ibn Jareer as quoted in AI Bidaaya wan Nihaaya (Vo!.? Pg.40). Haakim (Vol.3 Pg.451).
(All these are also in Hayatus Sahaba Vol 1 page no 238-241)
With which sword was Islam spread? Even if Muslims had it they could not use it to spread Islam forcefully because the Qur’an says in the following verse:
“Let there be no compulsion in religion: Truth stands out clear from error”
[Al-Qur’an 2:256]
But there is Sword of the Wisdom, Intellect love, mercy and Passion for mankind.
These sword that conquers the hearts and minds of people. The Qur’an says in Surah Nahl, chapter 16 verse 125:
“Invite (all) to the way of thy Lord with wisdom and beautiful preaching; and argue with them in ways that are best and most gracious.”
[Al-Qur’an 16:125].