Though the Polish insurrection in the Greater Poland Uprising of 1848 failed, many Poles had not lost sight of their longstanding dream of independence.
Mickiewicz had hoped to receive the support of Pope Pius IX, but many people rejected his proposals: even the majority of Poles living in Italy were unfavorable to the cause.
Other opposers were the clergy because of his adherence to Messianism, and the aristocracy because of his strong social ideals and the threat to their wealth and power should Poland become independent again.
The manifesto "Skład zasad, czyli Symbol polityczny Polski" (A collection of principles of a Political symbol of Poland) was composed by Mickiewicz for the legion and in fifteen short articles advocated freedom of conscience, equality of all citizens, equality of women, enfranchisement of peasants, solidarity and brotherhood of Slavic nations.
Once granted, the company then appealed to expand the Polish Legion to 60 people, which the provisional government of Milan allowed as well.