In 2000, it took a military operation to halt the march of water hyacinth in Harike, one of the internationally protected wetlands in India, famous for a large number of birds, both local and migratory. The invasive hyacinth problem was squeezing the life out of its 41-square-metre area for some time.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/saving-grace-harike
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-chandigarh
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-dispersal
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wetlands
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/harike-sa
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/birds
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/migratory-species
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wetland-conservation
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/asian-development-bank-adb
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ludhiana-d