The 1984 operation to take Siachen was one.
In both 1962 and Kargil, the enemy ame in when our troops were not actively manning the borders, which I guess is a logistical challenge in territory like that. In both cases, the intention of the eneny was to harrass rather than invade. Note that on both casesm, they did not build enough supply lines for a long stay.
As has been explained elsewhere on this forum (and that message keeps getting lost), there haven't been any instance of the PLA and IA troops coming into contact. Instead they play a cat and muse game. One group comes and moves the border markers and leave, another groups come and move them elsewhere.
And what supply lines would they use? Their supply lines would still have to go through the border.
I agree that border patrolling can be more vigorous and please note that 2 more divisions (25000 to 30000 troops) are being raised for that part of the country. But I am not sure what else you are trying to say.
Point 1: The point I was making was that in Kargil and in 1962, the troops should've been manning the borders at all times. If the Chinese could do it in Aksai Chin, so could we. But that was Nehru's mistake. Of course this has to do with the larger picture of the lack of equipment, infrastructure, support, but it's a problem nonetheless.
Point 2: About PLA, Indian Army cat-mouse game, that's the limited picture that we see through the Indian media. Here's the fact: Indian army is not really allowed by Indian govt. to even engage PLA, due to the agreement between India and China, which China has used to its advantage. The original agreement was to keep a certain distance (a km or more) away from LAC. India followed this agreement to the letter, while China kept building infrastructure closer and closer to the Indian military posts. When questioned, Chinese excuse was that in their opinion the LAC is much deeper into Arunachal. So now China has pushed in and created military infrastructure on Indian side of McMahon line (over 1 km deep into India in several places). At the same time, India has not upgraded its infrastructure in Arunachal much because of fear of it being used by enemy in case of war. So now there is an enormous difference in military infrastructure between India and China, with China having a considerable advantage. The govt has woken up late to this fact and are trying to catch up now (you must've read about the loan which China tried to block which was for this purpose). It's a sad reality when Indian Army has to form human chains to block Chinese vehicles and tractors from building military infrastructure further into India, even around Indian military posts.
The Indian Army keeps saying that Chinese intrusions are because of difference of opinion of LAC, but the fact is that what China calls Indian intrusions are just Indian soldiers wandering on Indian side of McMahon line being detained by Chinese; at no time have any Indian soldiers ever dared to venture beyond McMahon line. The Chinese intrusions on the other hand are even deeper into Arunachal beyond McMahon line (since Chinese already have military bases on Indian side of McMahon line).
Point 3: About supply lines, other than having built military infrastructure deeper into India, the Chinese may have also built tunnels that we don't know about. In any case, Chinese soldiers intruding deeper into Arunachal can lead to other dangerous situations like them supplying weapons to undercover agent cells, etc. They themselves don't have to fire stinger missiles at IAF aircraft; undercover people on Chinese payroll can do it too, after Chinese soldiers supply the weapons to them. That's why I am suspicious about the Indian AN-32 blowing up in mid-air (in Assam this summer), that I mentioned in my last post.
Point 4: Yes, finally the government has woken up and is raising further divisions, but they are still reactive in this case, not proactive; since they are doing it in reaction to Chinese military intrusions and heavy Chinese military infrastructure on Indian side of the McMahon line. What they should've done (or started doing few decades ago) is build heavy military infrastructure as close to McMahon line border as possible, instead of taking the word of the Chinese on some border agreement which the Chinese didn't eventually follow anyways. This way at least, the Chinese would not have had as deep a military presence in Arunachal as they do now. The fact is that Chinese have been taking control over more and more Indian territory in Arunachal Pradesh, Ladakh and elsewhere, while the netas in Delhi have been sleeping after signing peace agreements with China.
Anyhow, you were right about Indian army being pro-active in Siachen. But Indian government has been anything but pro-active against China, keeping peace at all costs (even at the cost of Chinese military presence deeper into India). It's as if after 1962 defeat, the netas have gotten scared of China to the point of inaction, and turning a blind eye to all Chinese activity on the border.
Had it been Pakistan instead of China, the politicans would not have allowed them to intrude so deeply into India (to the point of having military bases on Indian side), while using some peace agreement as cover. But the sad reality is that the netas only know how to fight Pakistan, and don't really have the willpower to fight China. If the netas had more faith and provided adequate funding, weapons and military infrastructure to Indian army in Arunachal, Ladakh, and elsewhere, we would not be having this discussion right now; and the Chinese would not have dared to intrude into India.
JMT