What advantages might a weaker army fighting on its home soil?

The following are the favorable circumstances may a weaker armed force battling on its home soil have over a more grounded attacking armed force: 
1.  They have the very important strategy as they are familiar with the routes.2. Neighborhood nationals bolster. 
3. Recruitment of new units, 
4. They spend substantially less cash on war. 5. Inspiration and good lift.