Property encroachment

watan land of 100 acre from ancestral property is divided as: 1/4 part to our father (elder) 1/4 to middle paternal uncle 50% to younger paternal uncle. our 1/4 part was cultivated nearly 80yrs by paternal cousin brother , but on paper our land is registered in our names. now the middle uncle sold his 1/4 part of land. the younger uncle is making havoc and entered our home with mob of 7 people for fight in thought of that we would too sell our 1/4 part of land (which is already in possesion of paternal cousin brother since he cultivating the land for 80yrs.) the 50% share younger uncle,is staying in neighbour to us and share common dividing line (no compound wall is built), is encorouching in our side by building bio gas and cattles shed. please guide what action to be taken since the land is in kolhapur gaon.